Contact Details
- Phone
- +64 3 479 7168
- ari.samaranayaka@otago.ac.nz
University Links
- Position
- Research Associate Professor and Biostatistician
- Qualifications
- BSc MPhil DipFGT DipFM PhD
- Research summary
- Methodological and biostatistical expertise in health-related research
- Memberships
- Research Ethics Committee, Department of Preventive and Social Medicine
Research
Associate Professor Ari Samaranayaka is a biostatistician in the Biostatistics Centre. He leads biostatistical and methodological aspects of health-related research projects in a range of disciplines such as public health, epidemiology, nephrology, physiotherapy, pharmacy, dentistry, immunology, and many more.
He works with many health researchers of varying capacities as research collaborator or a biostatistical advocate. He also provides supervision for postgraduate students in health-related and/or biostatistical research.
Publications
Derrett, S., Owen, H. E., Barson, D., Maclennan, B., Samaranayaka, A., Harcombe, H., & Wyeth, E. H. (2024). New Zealand’s Prospective Outcomes of Injury Study—10 years on (POIS-10): Descriptive outcomes to 12 years post-injury [Short report]. Injury Prevention. Advance online publication. doi: 10.1136/ip-2023-045058 Journal - Research Article
Du Plooy, K., Wishart, B., Scarf, D., & Samaranayaka, A. (2023). The impact of Green Prescription on sustained physical activity levels, quality of life, and mental health. Journal of Sport & Exercise Science, 7(4), (pp. 69-70). doi: 10.36905/jses.2023.04.01 Conference Contribution - Published proceedings: Abstract
Sopoaga, F., Nada-Raja, S., Leckie, T., Samaranayaka, A., & Covello, S. (2023). Mental health and well-being of first year Pacific students at a New Zealand university. Open Journal of Social Sciences, 11, 365-381. doi: 10.4236/jss.2023.117026 Journal - Research Article
Cameron, C., Samaranayaka, A., & Turner, R. (2023). The review process from a biostatistics perspective [Invited feature]. New Zealand Medical Student Journal, 35, 34-36. Journal - Research Other
Harcombe, H., Barson, D., Samaranayaka, A., Davie, G., Wyeth, E., Derrett, S., & McBride, P. (2023). Predictors of hospital readmission after trauma: A retrospective cohort study in New Zealand. Injury, 54(6), 1546-1552. doi: 10.1016/j.injury.2023.03.009 Journal - Research Article
2024
Journal - Research Article
Derrett, S., Owen, H. E., Barson, D., Maclennan, B., Samaranayaka, A., Harcombe, H., & Wyeth, E. H. (2024). New Zealand’s Prospective Outcomes of Injury Study—10 years on (POIS-10): Descriptive outcomes to 12 years post-injury [Short report]. Injury Prevention. Advance online publication. doi: 10.1136/ip-2023-045058
2023
Journal - Research Article
Sopoaga, F., Nada-Raja, S., Leckie, T., Samaranayaka, A., & Covello, S. (2023). Mental health and well-being of first year Pacific students at a New Zealand university. Open Journal of Social Sciences, 11, 365-381. doi: 10.4236/jss.2023.117026
Harcombe, H., Barson, D., Samaranayaka, A., Davie, G., Wyeth, E., Derrett, S., & McBride, P. (2023). Predictors of hospital readmission after trauma: A retrospective cohort study in New Zealand. Injury, 54(6), 1546-1552. doi: 10.1016/j.injury.2023.03.009
Owen, H. E., Samaranayaka, A., Wyeth, E. H., & Derrett, S. (2023). Psychological distress 12 years following injury in New Zealand: Findings from the Prospective Outcomes of Injury Study: 10 years on (POIS-10). Injury Epidemiology, 10, 9. doi: 10.1186/s40621-023-00419-8
Dixon, R., Derrett, S., Samaranayaka, A., Harcombe, H., Wyeth, E. H., Beaver, C., & Sullivan, M. (2023). Life satisfaction 18 months and 10 years following spinal cord injury: Results from a New Zealand prospective cohort study. Quality of Life Research. Advance online publication. doi: 10.1007/s11136-022-03313-w
Norris, P., Cousins, K., Horsburgh, S., Keown, S., Churchward, M., Samaranayaka, A., Smith, A., & Marra, C. (2023). Impact of removing prescription co-payments on the use of costly health services: A pragmatic randomised controlled trial. BMC Health Services Research, 23, 31. doi: 10.1186/s12913-022-09011-0
Chan, R., Walker, R. J., Samaranayaka, A., & Schollum, J. B. W. (2023). Long-term impact of early non-infectious complications at the initiation of peritoneal dialysis. Peritoneal Dialysis International, 43(1), 53-63. doi: 10.1177/08968608221132647
Journal - Research Other
Cameron, C., Samaranayaka, A., & Turner, R. (2023). The review process from a biostatistics perspective [Invited feature]. New Zealand Medical Student Journal, 35, 34-36.
Conference Contribution - Published proceedings: Abstract
Du Plooy, K., Wishart, B., Scarf, D., & Samaranayaka, A. (2023). The impact of Green Prescription on sustained physical activity levels, quality of life, and mental health. Journal of Sport & Exercise Science, 7(4), (pp. 69-70). doi: 10.36905/jses.2023.04.01
2022
Journal - Research Article
Gray, A. R., Cameron, C., Samaranayaka, A., & Turner, R. M. (2022). What statistical software should I use? And does it actually matter? New Zealand Medical Student Journal, (34), 38-40. Retrieved from https://www.nzmsj.com/
McBride, D., Samaranayaka, A., Richardson, A., Gardner, D., Shepherd, D., Wyeth, E., de Graaf, B., & Derrett, S. (2022). Factors associated with self-reported health among New Zealand military veterans: A cross-sectional study. BMJ Open, 12, e056916. doi: 10.1136/bmjopen-2021-056916
Butcher, E., Walker, R., Wyeth, E., Samaranayaka, A., Schollum, J., & Derrett, S. (2022). Health-related quality of life and disability among older New Zealanders with kidney failure: A prospective study. Canadian Journal of Kidney Health & Disease. Advance online publication. doi: 10.1177/20543581221094712
Kallarakkal, T. G., Siriwardena, B. S. M. S., Samaranayaka, A., De Silva, R., & Tilakaratne, W. M. (2022). A validated predictive model for risk of nodal metastasis in node negative oral squamous cell carcinoma of the buccal mucosa and tongue. Journal of Oral Pathology & Medicine, 51, 436-443. doi: 10.1111/jop.13294
Taylor, J. E., McLean, R., Samaranayaka, A., & Connolly, M. J. (2022). How does driving anxiety relate to the health and quality of life of older drivers? Journal of Applied Gerontology, 41(5), 1312-1320. doi: 10.1177/07334648211072540
Maclennan, B., Wyeth, E., Samaranayaka, A., & Derrett, S. (2022). Predictors of EQ-5D-3L outcomes amongst injured Māori: 1-year post-injury findings from a New Zealand cohort study. Quality of Life Research, 31, 1689-1701. doi: 10.1007/s11136-022-03085-3
Ameratunga, S., Samaranayaka, A., Wyeth, E. H., Davie, G., Lilley, R., Wilson, S., Kokaua, J., & Derrett, S. (2022). Prevalence and predictors of post-traumatic stress symptoms in 2200 hospitalised and non-hospitalised injured New Zealanders. Australian & New Zealand Journal of Psychiatry, 56(10), 1344-1356. doi: 10.1177/00048674211060747
Cryer, C., Gulliver, P., Davie, G., Samaranayaka, A., & Fowler, C. (2022). Missing cases of injury death: Use of quantitative methods and case reviews to inform future improvements in case definition. Injury Prevention, 28, 156-164. doi: 10.1136/injuryprev-2021-044371
Conference Contribution - Published proceedings: Abstract
Chan, R., Walker, R., Samaranayaka, A., & Schollum, J. (2022). Long term impact of early non-infectious complications at the initiation of peritoneal dialysis. Nephrology, 27(Suppl. 1), (pp. 59-60). doi: 10.1111/nep.14099
Ng, B., Smith, M., & Samaranayaka, A. (2022). Use and utility of teledentistry in aged residential care (ARC) facilities in the Otago region of New Zealand. New Zealand Dental Journal, 118(4), (pp. 170). [Abstract]
Owen, H., Wyeth, E., Samaranayaka, A., & Derrett, S. (2022). Prevalence and predictors of psychological distress at 12 years post-injury. Injury Prevention, 28(Suppl. 2), (pp. A53-A54). doi: 10.1136/injuryprev-2022-safety2022.160
Harcombe, H., Barson, D., Samaranayaka, A., Davie, G., Wyeth, E., & Derrett, S. (2022). Predictors of readmission after trauma: A retrospective cohort study in New Zealand. Injury Prevention, 28(Suppl. 2), (pp. A15-A16). doi: 10.1136/injuryprev-2022-safety2022.47
Norris, P., Cousins, K., Horsburgh, S., Keown, S., Samaranayaka, A., Churchward, M., Smith, A., & Marra, C. (2022). The FreeMeds study: Exploring the impact of $5 prescription charges on hospitalisations. Proceedings of the 12th Health Services and Policy Research Conference. 404. Retrieved from https://www.hsraanz.org
Conference Contribution - Verbal presentation and other Conference outputs
Owen, H., Samaranayaka, A., Wyeth, E., & Derrett, S. (2022, September). Prevalence and predictors of psychological distress at 12 years post-injury. Verbal presentation at the Postgraduate & Early Career Researchers Committee (PERC) & Division of Health Sciences Early & Mid-Career Researcher (EMCR) Joint Research Symposium, Dunedin, New Zealand.
2021
Journal - Research Article
Cameron, C., Turner, R., & Samaranayaka, A. (2021). Understanding confidence intervals and why they are so important. New Zealand Medical Student Journal, (33), 42-43. Retrieved from https://www.nzmsj.com/
Narayanan, A., Gill, M., Leem, C., Li, C., Mein Smith, F., Shepherd, B., … Samaranayaka, A., Ergler, C., & Macmillan, A. (2021). Students' use of caffeine, alcohol, dietary supplements, and illegal substances for improving academic performance in a New Zealand university. Health Psychology & Behavioral Medicine, 9(1), 917-932. doi: 10.1080/21642850.2021.1990763
Leitch, S., Dovey, S., Cunningham, W., Wallis, K., Eggleton, K., Lillis, S., McMenamin, A., Williamson, M., Reith, D., Samaranayaka, A., & Tilyard, M. (2021). Epidemiology of healthcare harm in New Zealand general practice: A retrospective records review study. BMJ Open, 11, e048316. doi: 10.1136/bmjopen-2020-048316
Richardson, A. E., Derrett, S., Samaranayaka, A., & Wyeth, E. H. (2021). Prevalence and predictors of psychological distress following injury: Findings from a prospective cohort study. Injury Epidemiology, 8(1), 41. doi: 10.1186/s40621-021-00337-7
Shettigar, R., Samaranayaka, A., Schollum, J. B. W., Wyeth, E. H., Derrett, S., & Walker, R. J. (2021). Predictors of health deterioration among older New Zealanders undergoing dialysis: A three-year accelerated longitudinal cohort study. Canadian Journal of Kidney Health & Disease, 8. doi: 10.1177/20543581211022207
Samaranayaka, A., Cameron, C., & Turner, R. M. (2021). Sample size in health research. New Zealand Medical Student Journal, 32, 52-54. Retrieved from https://www.nzmsj.com/
Connor, J., Brookland, R., & Samaranayaka, A. (2021). Older drivers and their future mobility: Views and involvement of their adult children. Journal of Applied Gerontology, 40(1), 55-66. doi: 10.1177/0733464819894545
Richardson, A., Samaranayaka, A., Sullivan, M., & Derrett, S. (2021). Secondary health conditions and disability among people with spinal cord injury: A prospective cohort study. Journal of Spinal Cord Medicine, 44(1), 19-28. doi: 10.1080/10790268.2019.1581392
Journal - Research Other
Cousins, K., Norris, P., Horsburgh, S., Smith, A., Keown, S., Samaranayaka, A., Marra, C., & Churchward, M. (2021). Impact of removing prescription charges on health outcomes: Protocol for a randomised controlled trial. BMJ Open, 11, e049261. doi: 10.1136/bmjopen-2021-049261
Derrett, S., Wyeth, E. H., Richardson, A., Davie, G., Samaranayaka, A., Lilley, R., & Harcombe, H. (2021). Prospective Outcomes of Injury Study 10 Years on (POIS-10): An observational cohort study. Methods & Protocols, 4(2), 35. doi: 10.3390/mps4020035
Conference Contribution - Published proceedings: Abstract
Norris, P., Cousins, K., Horsburgh, S., Smith, A., Keown, S., Samaranayaka, A., … Marra, C. (2021). Randomised controlled trial of removing prescription charges: Preliminary findings of the FreeMeds Study. Proceedings of the 6th Pharmacoepidemiology Research Network Symposium. (pp. 21-22). Retrieved from https://www.otago.ac.nz/pharmacoepidemiology
Dixon, R., Derrett, S., Harcombe, H., Wyeth, E., & Samaranayaka, A. (2021). Life satisfaction among people experiencing spinal cord injuries: A scoping review. Proceedings of the University of Otago Student Research Symposium: Te Wānaka Rakahau: Ākoka. (pp. 24). [Abstract]
2020
Journal - Research Article
Cameron, C., Samaranayaka, A., & Turner, R. M. (2020). P values: What are their significance? New Zealand Medical Student Journal, 31, 48-49.
Harcombe, H., Samaranayaka, A., Wyeth, E. H., Davie, G., Cameron, I. D., Lilley, R., & Derrett, S. (2020). Predictors of subsequent injury at work: Findings from a prospective cohort of injured workers in New Zealand. Occupational & Environmental Medicine, 77, 839-846. doi: 10.1136/oemed-2020-106597
Sopoaga, F., Nada-Raja, S., Leckie, T., & Samaranayaka, A. (2020). Mental health and wellbeing of Pacific students: Protocol of a Pacific perspective study. Pacific Health Dialog, 21(5), 272-280. doi: 10.26635/phd.2020.626
Richardson, A., Gurung, G., Samaranayaka, A., Gardner, D., de Graaf, B., Wyeth, E. H., Derrett, S., … McBride, D. (2020). Risk and protective factors for post-traumatic stress among New Zealand military personnel: A cross sectional study. PLoS ONE, 15(4), e0231460. doi: 10.1371/journal.pone.0231460
Turner, R., Samaranayaka, A., & Cameron, C. (2020). Parametric vs nonparametric statistical methods: Which is better, and why? New Zealand Medical Student Journal, 30, 61-62.
Conference Contribution - Published proceedings: Abstract
Shettigar, R., Schollum, J., Derrett, S., Samaranayaka, A., McNoe, B., & Walker, R. (2020). Predictors of health deterioration of older adults after 24 months and 36 months of dialysis therapy. Nephrology, 25(Suppl. 3), (pp. 15). doi: 10.1111/nep.13797
2019
Journal - Research Article
Samaranayaka, A., Turner, R., & Cameron, C. (2019). Kaplan-Meier plots. New Zealand Medical Student Journal, 28, 45-46.
Turner, R. M., Cameron, C., & Samaranayaka, A. (2019). Understanding receiver operator characteristic (ROC) curves. New Zealand Medical Student Journal, 29, 50-51.
Cryer, C., Davie, G., Gulliver, P., & Samaranayaka, A. (2019). Use of mixed methods to investigate case definitions to improve the identification of serious injury cases from hospital episode data. Injury Prevention, 25(6), 552-556. doi: 10.1136/injuryprev-2019-043293
Wyeth, E., Lambert, M., Samaranayaka, A., Harcombe, H., Davie, G., & Derrett, S. (2019). Subsequent injuries experienced by Māori: Results from a 24-month prospective study in New Zealand. New Zealand Medical Journal, 132(1499), 23-35. Retrieved from https://www.nzma.org.nz/journal
Baker, W., Samaranayaka, A., Wyeth, E., Ameratunga, S., & Derrett, S. (2019). Migrants and disability following injury: Findings from a prospective study in New Zealand. Australian & New Zealand Journal of Public Health, 43(5), 470-476. doi: 10.1111/1753-6405.12927
McNoe, B., Schollum, J. B. W., Derrett, S., Marshall, M. R., Henderson, A., Samaranayaka, A., & Walker, R. J. (2019). Recruitment and participant baseline characteristics in the dialysis outcomes in those aged 65 years or older study. BMC Nephrology, 20, 137. doi: 10.1186/s12882-019-1328-8
Chan, J. E., Samaranayaka, A., & Paterson, H. (2019). Seasonal and gestational variation in perinatal depression in a prospective cohort in New Zealand. Australian & New Zealand Journal of Obstetrics & Gynaecology, 59, 514-522. doi: 10.1111/ajo.12912
Wyeth, E. H., Samaranayaka, A., Lambert, M., Tapsell, M., Anselm, D., Ellison, P., … Derrett, S. (2019). Understanding longer-term disability outcomes for Māori and non-Māori after hospitalisation for injury: Results from a longitudinal cohort study. Public Health, 176, 118-127. doi: 10.1016/j.puhe.2018.08.014
Derrett, S., Gunter, K. E., Samaranayaka, A., Singer, S. J., Nocon, R. S., Quinn, M. T., … Chin, M. H. (2019). Development and testing of the Provider and Staff Perceptions of Integrated Care (PSPIC) survey. Medical Care Research & Review, 76(6), 807-829. doi: 10.1177/1077558717745936
Conference Contribution - Published proceedings: Abstract
Brookland, R., Owen, H., Connor, J., Kerse, N., Taylor, J., Crengle, S., … Cameron, C., Samaranayaka, A., & Connolly, M. (2019). Transport practices, mobility needs and cessation planning: New Zealand Prospective Older Adult Transport and Health Study (NZPATHS). Proceedings of the 6th Annual Transport Knowledge Conference (TKC): Transport's Contribution to Wellbeing and Liveability. (pp. 31-32). Retrieved from https://www.transportknowledgeconference.nz/
McBride, D., Gardner, D., Richardson, A., Wyeth, E., Samaranayaka, A., Gurung, G., & Derrett, S. (2019). The health and wellbeing of New Zealand veterans. Occupational & Environmental Medicine, 76(Suppl. 1), (pp. A47). doi: 10.1136/OEM-2019-EPI.127
Norris, P., Cousins, K., Keown, S., Churchward, M., Smith, A., Marra, C., Horsburgh, S., & Samaranayaka, A. (2019). Do free medicines improve people's health? A randomised controlled trial of prescription charges. Proceedings of the 11th Health Services and Policy Research Conference (HSRAANZ): Addressing Health Service Inequities to Improve Health System Performance. Retrieved from www.healthservicesconference.com.au
Harcombe, H., Samaranayaka, A., Wyeth, E. H., Davie, G., Cameron, I. D., & Derrett, S. (2019). Injured at work: Factors predictive of further work-related injuries: A prospective study. Occupational & Environmental Medicine, 76(Suppl. 1), (pp. A41). doi: 10.1136/OEM-2019-EPI.112
2018
Journal - Research Article
Taylor, J. E., Connolly, M. J., Brookland, R., & Samaranayaka, A. (2018). Understanding driving anxiety in older adults. Maturitas, 118, 51-55. doi: 10.1016/j.maturitas.2018.10.008
Windner, Z., Crengle, S., de Graaf, B., Samaranayaka, A., & Derrett, S. (2018). New Zealanders' experiences and pathways to a diagnosis of bowel cancer: A cross-sectional descriptive study of a younger cohort. New Zealand Medical Journal, 131(1483), 30-39. Retrieved from https://www.nzma.org.nz/journal
Samaranayaka, S., Walker, R. J., Samaranayaka, A., Derrett, S., & Schollum, J. B. W. (2018). Medication exposure and health outcomes in older patients with end-stage kidney disease: A prospective study undertaken in New Zealand. Drugs & Aging, 35, 1005-1015. doi: 10.1007/s40266-018-0582-y
De Silva, R. K., Siriwardena, B. S. M. S., Samaranayaka, A., Abeyasinghe, W. A. M. U. L., & Tilakaratne, W. M. (2018). A model to predict nodal metastasis in patients with oral squamous cell carcinoma. PLoS ONE, 13(8), e0201755. doi: 10.1371/journal.pone.0201755
Leitch, S., Dovey, S. M., Samaranayaka, A., Reith, D. M., Wallis, K. A., Eggleton, K. S., … Williamson, M. I., … Tilyard, M. W. (2018). Characteristics of a stratified random sample of New Zealand general practices. Journal of Primary Health Care, 10(2), 114-124. doi: 10.1071/HC17089
Davie, G., Samaranayaka, A., & Derrett, S. (2018). The role of pre-existing comorbidity on the rate of recovery following injury: A longitudinal cohort study. PLoS ONE, 13(2), e0193019. doi: 10.1371/journal.pone.0193019
Harcombe, H., Davie, G., Wyeth, E., Samaranayaka, A., & Derrett, S. (2018). Injury upon injury: A prospective cohort study examining subsequent injury claims in the 24 months following a substantial injury. Injury Prevention, 24(6), 460-467. doi: 10.1136/injuryprev-2017-042467
Conference Contribution - Published proceedings: Abstract
Davie, G., Samaranayaka, A., & Derrett, S. (2018). Rate of recovery following injury: The role of comorbidity. Proceedings of the Australasian Epidemiological Association (AEA) 31st Annual Scientific Meeting. 92. Retrieved from https://aea.asn.au
Beaumont, S., Brookland, R., Connor, J., & Samaranayaka, A. (2018). Preparing for driving cessation: More thought than action [Extended abstract]. Proceedings of the Australasian Road Safety Conference (ARSC). Retrieved from http://acrs.org.au/
Samaranayaka, A., De Silva, R. K., Siriwardena, B. S. M. S., Abeyasinghe, W. A. M. U. L., & Tilakaratne, W. M. (2018). A predictive model for nodal metastases among oral cancer patients. Proceedings of the Australasian Applied Statistics (AASC) Conference. (pp. 59). Retrieved from https://www.aasc.nz/
Turner, R., Cameron, C., Iosua, E., & Samaranayaka, A. (2018). Establishing a Biostatistics Unit at the University of Otago. Proceedings of the Australasian Applied Statistics (AASC) Conference. (pp. 10). Retrieved from https://www.aasc.nz/
Harcombe, H., Aldabe, D., Davie, G., Wyeth, E., Samaranayaka, A., & Derrett, S. (2018). Subsequent injuries in the 24-months following an Accident Compensation Corporation (ACC) entitlement claim injury among a general injury cohort. Proceedings of the Physiotherapy New Zealand Conference. (pp. 61). Retrieved from https://pnz.org.nz/conference
Richardson, A., Samaranayaka, A., & Derrett, S. (2018). Self-efficacy and disability among people with spinal cord injury: A longitudinal exploration. International Journal of Behavioral Medicine, 25(Suppl. 1), (pp. S184-S185). doi: 10.1007/s12529-018-9740-1
Richardson, A., Nunnerley, J., Bourke, J., McAllister, S., Samaranayaka, A., Sullivan, M., & Derrett, S. (2018). Secondary health conditions following spinal cord injuries. International Journal of Behavioral Medicine, 25(Suppl. 1), (pp. S32). doi: 10.1007/s12529-018-9740-1
Chan, J., Paterson, H., & Samaranayaka, A. (2018). Seasonal and gestational variation in perinatal depression in a prospective cohort in New Zealand. Australian & New Zealand Journal of Obstetrics & Gynaecology, 58(Suppl. 1), (pp. 28). doi: 10.1111/ajo.12873
Conference Contribution - Poster Presentation (not in published proceedings)
Richardson, A., Nunnerley, J., Bourke, J., McAllister, S., Samaranayaka, A., Sullivan, M., & Derrett, S. (2018, September). Secondary health conditions following spinal cord injury. Poster session presented at the 57th International Spinal Cord Society (ISCoS) and 25th Australia New Zealand Spinal Cord Society (ANZSCoS) Combined Annual Scientific Meeting, Sydney, Australia.
2017
Journal - Research Article
Derrett, S., Samaranayaka, A., Schollum, J. B. W., McNoe, B., Marshall, M. R., Williams, S., Wyeth, E. H., & Walker, R. J. (2017). Predictors of health deterioration among older adults after 12 months of dialysis therapy: A longitudinal cohort study from New Zealand. American Journal of Kidney Diseases, 70(6), 798-806. doi: 10.1053/j.ajkd.2017.06.023
Samaranayaka, C., Samaranayaka, A., Barson, D., & De Silva, R. K. (2017). Factors influencing trends in trauma-associated orbital cavity reconstruction procedures and time delay: New Zealand national data 2000–2014. Trauma, 20(4), 258-267. doi: 10.1177/1460408617719477
Hoye, N. A., Wilson, L. C., Wilkins, G. T., Jardine, D. L., Putt, T. L., Samaranayaka, A., Schollum, J. B. W., & Walker, R. J. (2017). Endovascular renal denervation in end-stage kidney disease patients: Cardiovascular protection: A proof-of-concept study. Kidney International Reports, 2(5), 856-865. doi: 10.1016/j.ekir.2017.04.012
Page, M. J., Wyeth, E. H., Samaranayaka, A., McNoe, B., Walker, R. C., Schollum, J., … Walker, R., & Derrett, S. (2017). Accuracy of ethnicity data recorded in hospital-based patient clinical records and the Australia and New Zealand Dialysis and Transplant Registry. New Zealand Medical Journal, 130(1454), 65-71. Retrieved from https://www.nzma.org.nz/journal
Wyeth, E. H., Samaranayaka, A., Davie, G., & Derrett, S. (2017). Prevalence and predictors of disability for Māori 24 months after injury. Australian & New Zealand Journal of Public Health, 41(3), 262-268. doi: 10.1111/1753-6405.12657
Journal - Research Other
Dovey, S. M., Leitch, S., Wallis, K. A., Eggleton, K. S., Cunningham, W. K., Williamson, M. I., … Tilyard, M. W., Reith, D. M., Samaranayaka, A., & Hall, J. E. (2017). Epidemiology of patient harms in New Zealand: Protocol of a general practice records review study. JMIR Research Protocols, 6(1), e10. doi: 10.2196/resprot.6696
Derrett, S., Harcombe, H., Wyeth, E., Davie, G., Samaranayaka, A., Hansen, P., … Sullivan, T., Wilson, S., & Barson, D. (2017). Subsequent Injury Study (SInS): Improving outcomes for injured New Zealanders. Injury Prevention, 23(6), 429. doi: 10.1136/injuryprev-2016-042193
Conference Contribution - Published proceedings: Abstract
Derrett, S., Gunter, K., Samaranayaka, A., Singer, S., Nocon, R., Quinn, M., … Chin, M. (2017). Development and testing of the Provider and Staff Perceptions of Integrated Care (PSPIC) survey: Provisional results. International Journal of Integrated Care, 17(3), A124. doi: 10.5334/ijic.3236
Wyeth, E. H., Lambert, M., Tapsell, M., Samaranayaka, A., Harwood, M., Anselm, D., Ellison, P., … Derrett, S. (2017). Long-term disability outcomes after hospitalisation for injury. Proceedings of the 13th Australasian Injury Prevention and Safety Promotion Conference. (pp. 282). Retrieved from http://event.icebergevents.com.au/injuryprevention2017
Harcombe, H., Aldabe, D., Davie, G., Wyeth, E., Samaranayaka, A., & Derrett, S. (2017). Complexities of subsequent injury among a New Zealand cohort. Proceedings of the Australasian Epidemiological Association (AEA) 30th Anniversary Meeting. Retrieved from https://aea.asn.au
Wyeth, E., Lambert, M., Tapsell, M., Samaranayaka, A., Derrett, S., Harwood, M., … Wright-Tawha, T. (2017). Long-term disability outcomes after hospitalisation for injury. Proceedings of the New Zealand Public Health Association (PHA) Conference. 38. Retrieved from http://www.conference.co.nz/phanz17
Harcombe, H., Aldabe, D., Davie, G., Wyeth, E., Samaranayaka, A., & Derrett, S. (2017). Subsequent injuries in the 24-months following an Accident Compensation Corporation (ACC) entitlement claim injury among a general injury cohort. Proceedings of the New Zealand Rehabilitation Conference: Making an Impact: Putting Knowledge to Work in Rehabilitation. Retrieved from http://www.nzrehabconference2017.co.nz/
Conference Contribution - Poster Presentation (not in published proceedings)
Richardson, A., Derrett, S., Nunnerley, J., Bourke, J., McAllister, S., & Samaranayaka, A. (2017, November). The experience of secondary health conditions following spinal cord injury (SCI). Poster session presented at the Disability Matters Conference, Dunedin, New Zealand.
2016
Journal - Research Article
Harcombe, H., Samaranayaka, A., & Derrett, S. (2016). Predictors of reduced frequency of physical activity 3 months after injury: Findings from the prospective outcomes of injury study. Physical Therapy, 96(12), 1885-1895. doi: 10.2522/ptj.20160038
Journal - Research Other
Tun, T., Nyunt, W. W., Latt, K. Z., Samaranayaka, A., Crump, J. A., Thinn, K. K., Cook, G. M., & Aung, H. L. (2016). Drug-resistant tuberculosis among previously treated patients in Yangon, Myanmar. International Journal of Mycobacteriology, 5(3), 366-367. doi: 10.1016/j.ijmyco.2016.06.004
Conference Contribution - Published proceedings: Abstract
Harcombe, H., Samaranayaka, A., & Derrett, S. (2016). Behavioral risk factors and poor EQ-5D health status: Provisional findings. International Journal of Behavioral Medicine, 23(Suppl. 1), (pp. S249-S250). doi: 10.1007/s12529-016-9586-3
McAllister, S., Imaculata, S., Kerry, S., Critchley, J., van Crevel, R., Hill, P., … Samaranayaka, A., & Derrett, S. (2016). Using the EQ-5D-5L to assess health-related quality of life: What does it tell us? Examples from two studies in Bandung, Indonesia. Proceedings of the Otago Global Health Institute (OGHI) 9th Annual Conference. (pp. 14-15). Retrieved from http://dnmeds.otago.ac.nz/departments/psm/research/international_hlth/conference/
2015
Journal - Research Article
Nixon, G., Samaranayaka, A., de Graaf, B., McKechnie, R., Rodwell, P., & Blattner, K. (2015). The impact of a rural scanner in overcoming urban versus rural disparities in the utilisation of computed tomography. Australian Journal of Rural Health, 23, 150-154. doi: 10.1111/ajr.12125
Slatter, T. L., Hsia, H., Samaranayaka, A., Sykes, P., Clow, W., Devenish, C. J., … Royds, J. A., … Hung, N. A. (2015). Loss of ATRX and DAXX expression identifies poor prognosis for smooth muscle tumours of uncertain malignant potential and early stage uterine leiomyosarcoma. Journal of Pathology: Clinical Research, 1(2), 95-105. doi: 10.1002/cjp2.11
Conference Contribution - Published proceedings: Abstract
Green, J., Ergler, C., Macmillan, A., Samaranayaka, A., Gill, M., Leem, C., Li, C., Narayanan, A., Shepherd, B., Ting, S., & van Bart, K. (2015). Substance use for coping with academic pressure and increasing performance. Proceedings of the European Health Psychology Society (EHPS) 29th Conference: Principles of Behaviour Change in Health and Illness. (pp. 175). Retrieved from http://www.ehps2015.org/
Leitch, S., Dovey, S., Wallis, K., Eggleton, K., Lillis, S., McMenamin, A., Williamson, M., Cunningham, W., Tilyard, M., Reith, D., & Samaranayaka, A. (2015). General practice e-records for research: To use or not to use? Proceedings of the Royal New Zealand College of General Practitioners (RNZCGP) Conference for General Practice: Imagine: Inspire: Innovate. Retrieved from http://www.generalpractice.org.nz/gp15
Conference Contribution - Poster Presentation (not in published proceedings)
Ibrahim, A., Jackson, C., Derrett, S., & Samaranayaka, A. (2015, October). Colonoscopy referral criteria in faster cancer treatment pathway for patients at Southern District Health Board. Poster session presented at the Otago Spotlight Series: Cancer Research, Wellington, New Zealand.
Conference Contribution - Verbal presentation and other Conference outputs
Wyeth, E., Derrett, S., & Samaranayaka, A. (2015, May). Understanding disability for Māori 24 months after injury. Verbal presentation at the Hui Poutama: Māori Research Symposium, Dunedin, New Zealand.
2014
Journal - Research Article
Connor, J., Cousins, K., Samaranayaka, A., & Kypri, K. (2014). Situational and contextual factors that increase the risk of harm when students drink: Case-control and case-crossover investigation. Drug & Alcohol Review, 33(4), 401-411. doi: 10.1111/dar.12172
Nixon, G., Samaranayaka, A., de Graaf, B., McKechnie, R., Blattner, K., & Dovey, S. (2014). Geographic disparities in the utilisation of computed tomography scanning services in southern New Zealand. Health Policy, 118(2), 222-228. doi: 10.1016/j.healthpol.2014.05.002
Harcombe, H., Derrett, S., Samaranayaka, A., Davie, G., Wyeth, E., & Wilson, S. (2014). Factors predictive of subsequent injury in a longitudinal cohort study. Injury Prevention, 20(6), 393-400. doi: 10.1136/injuryprev-2014-041183
Langley, J., Lilley, R., Samaranayaka, A., & Derrett, S. (2014). Work status and disability trajectories over 12 months after injury among workers in New Zealand. New Zealand Medical Journal, 127(1390). Retrieved from http://www.nzma.org.nz/journal
Cryer, C., Samaranayaka, A., Langley, J. D., & Davie, G. (2014). The epidemiology of life-threatening work-related injury: A demonstration paper. American Journal of Industrial Medicine, 57(4), 425-437. doi: 10.1002/ajim.22301
Cryer, C., Langley, J. D., Samaranayaka, A., Davie, G., Morgaine, K., Lilley, R., & Barson, D. (2014). An outcome evaluation of a New Zealand farm safety intervention: A historical cohort study. American Journal of Industrial Medicine, 57(4), 458-467. doi: 10.1002/ajim.22290
Wilson, S. J., Derrett, S., Cameron, I. D., Samaranayaka, A., Davie, G., & Langley, J. (2014). Prevalence of poor outcomes soon after injury and their association with the severity of the injury. Injury Prevention, 20, 57-61. doi: 10.1136/injuryprev-2012-040690
Langley, J. D., Lilley, R., Wilson, S., Derrett, S., Samaranayaka, A., Davie, G., … Wyeth, E. H., Hansen, P., & Hokowhitu, B. (2014). Factors associated with non-participation in one or two follow-up phases in a cohort study of injured adults. Injury Prevention, 19, 428-433. doi: 10.1136/injuryprev-2012-040685
Conference Contribution - Published proceedings: Full paper
Adam, L., Bond, C., & Samaranayaka, A. (2014). "The score doesn't mean much": Students' and staff understandings of text matching software. In B. Hegarty, J. McDonald & S.-K. Loke (Eds.), Proceedings of the Australasian Society for Computers in Learning in Tertiary Education (ascilite) Conference: Rhetoric and Reality: Critical Perspectives on Educational Technology. (pp. 399-403). Retrieved from http://ascilite2014.otago.ac.nz/
Conference Contribution - Published proceedings: Abstract
Derrett, S., Gunter, K., Samaranayaka, A., Nocon, R., Campbell, A., Schaefer, C., … Chin, M. (2014). Provider and staff ratings of care integration at US community health centers. Proceedings of the New Zealand Population Health Congress: Connecting Communities, Policy and Science. (pp. 238). Retrieved from http://www.pophealthcongress.org.nz/nzphc14/programme/programme
Derrett, S., Wilson, S., Samaranayaka, A., Langley, J., Davie, G., Wyeth, E., Lilley, R., & Ameratunga, S. (2014). The Prospective Outcomes of Injury Study (POIS): Predictors of disability and poor health service experiences among a cohort of injured New Zealanders. Proceedings of the New Zealand Population Health Congress: Connecting Communities, Policy and Science. (pp. 162). Retrieved from http://www.pophealthcongress.org.nz/nzphc14/programme/programme
Derrett, S., Wilson, S., Samaranayaka, A., Langley, J., Davie, G., Wyeth, E., Lilley, R., & Ameratunga, S. (2014). Predictors of disability among a cohort of 2,856 injured New Zealanders. Australasian Epidemiologist, 21(3), (pp. 92-93). [Abstract]
Ameratunga, S., Samaranayaka, A., Wilson, S., Davie, G., Lilley, R., Wyeth, E., Kokaua, J., & Derrett, S. (2014). Prevalence and predictors of post-traumatic stress among 2,220 injured New Zealanders: Findings among hospitalised and non-hospitalised subgroups. Australasian Epidemiologist, 21(3), (pp. 36). [Abstract]
Conference Contribution - Verbal presentation and other Conference outputs
Wyeth, E., Derrett, S., & Samaranayaka, A. (2014, October). Predictors of disability for Māori 24 months after injury. Verbal presentation at the International Network in Indigenous Health Knowledge and Development (INIHKD) and Network Environment for Aboriginal Health Research (NEAHR) Conference, Manitoba, Canada.
2013
Journal - Research Article
Derrett, S., Wilson, S., Samaranayaka, A., Langley, J., Wyeth, E., Ameratunga, S., Lilley, R., Davie, G., & Mauiliu, M. (2013). Prevalence and predictors of disability 24-months after injury for hospitalised and non-hospitalised participants: Results from a longitudinal cohort study in New Zealand. PLoS ONE, 8(11), e80194. doi: 10.1371/journal.pone.0080194
Mauiliu, M., Derrett, S., Samaranayaka, A., Sopoaga, F., Kokaua, J., & Davie, G. (2013). Pacific peoples three months after injury: A comparison of outcomes between Pacific and non-Pacific participants in a NZ cohort study. Australian & New Zealand Journal of Public Health, 37(5), 463-469. doi: 10.1111/1753-6405.12124
Langley, J., Begg, D., Samaranayaka, A., Brookland, R., & Weiss, H. (2013). Unsupervised driving by learner licence holders: Associated characteristics and crash risk. Accident Analysis & Prevention, 60, 24-30. doi: 10.1016/j.aap.2013.07.021
Wyeth, E. H., Derrett, S., Hokowhitu, B., & Samaranayaka, A. (2013). Indigenous injury outcomes: Life satisfaction among injured Māori in New Zealand three months after injury. Health & Quality of Life Outcomes, 11, 120. doi: 10.1186/1477-7525-11-120
Langley, J., Samaranayaka, A., & Begg, D. J. (2013). Age, period and cohort effects on the incidence of motorcyclist casualties in traffic crashes. Injury Prevention, 19(3), 153-157. doi: 10.1136/injuryprev-2012-040345
Chalmers, D. J., Samaranayaka, A., & McNoe, B. M. (2013). Risk factors for injury in community-level football: A cohort study. International Journal of Injury Control & Safety Promotion, 20(1), 68-78. doi: 10.1080/17457300.2012.674044
Conference Contribution - Published proceedings: Abstract
Mauiliu, M., Derrett, S., Samaranayaka, A., Sopoaga, F., Kokaua, J., & Davie, G. (2013). Outcomes for Pacific peoples following injury. In C. Matthewson, M. Taumoepeau, G. Burnett & I. Iati (Eds.), Proceedings of the Pacific Postgraduate Symposium: Pacific Voices X. (pp. 41). Dunedin, New Zealand: Pacific Islands Centre, University of Otago. [Abstract]
Conference Contribution - Poster Presentation (not in published proceedings)
Derrett, S., Wilson, S., Samaranayaka, A., Langley, J. D., Ameratunga, S., Davie, G., Lilley, R., Wyeth, E., & Cameron, I. D. (2013, March). Pre-injury and injury-related predictors of disability 12 and 24-months after injury among those hospitalised and non-hospitalised. Poster session presented at the New Zealand Rehabilitation Conference: Connecting, Living, Rebuilding, Nelson, New Zealand.
Commissioned Report for External Body
Lilley, R., Samaranayaka, A., & Weiss, H. (2013). International comparison of International Labour Organisation published occupational fatal injury rates: How does New Zealand compare internationally? Commissioned by Independent Taskforce on Workplace Health and Safety. Dunedin, New Zealand: Injury Prevention Research Unit, Department of Preventive and Social Medicine, University of Otago. 38p. Retrieved from http://www.hstaskforce.govt.nz/documents/comparison-of-ilo-published-occupational-fatal-injury-rates.pdf
2012
Journal - Research Article
Derrett, S., Samaranayaka, A., Wilson, S., Langley, J., Ameratunga, S., Cameron, I. D., Lilley, R., Wyeth, E., & Davie, G. (2012). Prevalence and predictors of sub-acute phase disability after injury among hospitalised and non-hospitalised groups: A longitudinal cohort study. PLoS ONE, 7(9), e44909. doi: 10.1371/journal.pone.0044909
Langley, J., Begg, D., Brookland, R., Samaranayaka, A., Jordan, H., & Davie, G. (2012). Nonprogression through graduated driver licensing: Characteristics, traffic offending, and reasons for nonprogression. Traffic Injury Prevention, 13(1), 7-13. doi: 10.1080/15389588.2011.635170
Chalmers, D. J., Samaranayaka, A., Gulliver, P., & McNoe, B. (2012). Risk factors for injury in rugby union football in New Zealand: A cohort study. British Journal of Sports Medicine, 46(2), 95-102. doi: 10.1136/bjsports-2011-090272
Begg, D., Sullman, M., & Samaranayaka, A. (2012). The characteristics of young pre-licensed drivers: Evidence from the New Zealand Drivers Study. Accident Analysis & Prevention, 45, 539-546. doi: 10.1016/j.aap.2011.09.006
Wilson, S. J., Begg, D. J., & Samaranayaka, A. (2012). Validity of using linked hospital and police traffic crash records to analyse motorcycle injury crash characteristics. Accident Analysis & Prevention, 49, 30-35. doi: 10.1016/j.aap.2011.03.007
Conference Contribution - Published proceedings: Abstract
Derrett, S., Samaranayaka, A., Wilson, S., Langley, J. D., Ameratunga, S., Cameron, I. D., Lilley, R., Wyeth, E., & Davie, G. (2012). Pre-injury and injury-related predictors of disability 3 and 12 months after injury: Hospitalised and non-hospitalised. Injury Prevention, 18(Suppl. 1), (pp. A18). doi: 10.1136/injuryprev-2012-040580b.11
2011
Journal - Research Article
Kypri, K., Samaranayaka, A., Connor, J., Langley, J. D., & MacLennan, B. (2011). Non-response bias in a web-based health behaviour survey of New Zealand tertiary students. Preventive Medicine, 53(4-5), 274-277. doi: 10.1016/j.ypmed.2011.07.017
Davie, G., Samaranayaka, A., Langley, J. D., & Barson, D. (2011). Estimating person-based injury incidence: Accuracy of an algorithm to identify readmissions from hospital discharge data. Injury Prevention, 17(5), 338-342. doi: 10.1136/injuryprev-2011-040090
Derrett, S., Davie, G., Ameratunga, S., Wyeth, E., Colhoun, S., Wilson, S., Samaranayaka, A., Lilley, R., Hokowhitu, B., Hansen, P., & Langley, J. (2011). Prospective Outcomes of Injury Study: Recruitment, and participant characteristics, health and disability status. Injury Prevention, 17(6), 415-418. doi: 10.1136/injuryprev-2011-040044
Cryer, C., Gulliver, P., Langley, J., Davie, G., Samaranayaka, A., & Fowler, C. (2011). A proposed theoretical definition to address the undercounting of injury deaths. Injury Prevention, 17, 219-221. doi: 10.1136/injuryprev-2011-040039
Langley, J., Samaranayaka, A., Davie, G., & Campbell, A. J. (2011). Age, cohort and period effects on hip fracture incidence: Analysis and predictions from New Zealand data 1974-2007. Osteoporosis International, 22(1), 105-111. doi: 10.1007/s00198-010-1205-6
Commissioned Report for External Body
Simpson, J., Purnell, M., & Samaranayaka, A. (2011). Correct use of child restraints: Methodology development. Commissioned by Ministry of Transport. Dunedin, New Zealand: Injury Prevention Research Unit, University of Otago. 46p.
Cryer, C., Gulliver, P., Langley, J., Davie, G., & Samaranayaka, A. (2011). NZIPS serious injury case definition review: The New Zealand Injury Prevention Strategy Serious Injury Outcome Indicators: Does the case definition of serious non-fatal injury miss a material number of serious injury cases? [Official Statistics Research Series Report]. Commissioned by Official Statistics Research. Wellington, New Zealand: Statistics New Zealand. 38p.
2010
Journal - Research Article
Samaranayaka, A., & Fletcher, D. (2010). Modelling environmental stochasticity in adult survival for a long-lived species. Ecological Modelling, 221(3), 423-427. doi: 10.1016/j.ecolmodel.2009.10.016
Conference Contribution - Published proceedings: Abstract
Cryer, C., Gulliver, P., Samaranayaka, A., Davie, G., & Langley, J. (2010). Injury deaths: Are we missing a material number of cases? Injury Prevention. 16(Suppl. 1), (pp. A142). doi: 10.1136/ip.2010.029215.508
Cryer, C., Gulliver, P., Langley, J., Davie, G., & Samaranayaka, A. (2010). Does the current New Zealand case definition of serious non-fatal injury miss a material number of serious injury cases? Injury Prevention. 16(Suppl. 1), (pp. A141-A142). doi: 10.1136/ip.2010.029215.507
Working Paper; Discussion Paper; Technical Report
Cryer, C., Gulliver, P., Samaranayaka, A., Davie, G., Langley, J., & Fowler, C. (2010). New Zealand Injury Prevention Strategy indicators of injury death: Are we counting all the cases? [IPRU Report No. OR085]. Dunedin, New Zealand: Injury Prevention Research Unit, Department of Preventive and Social Medicine, University of Otago. 107p.
2009
Conference Contribution - Published proceedings: Abstract
Cryer, C., Gulliver, P., Samaranayaka, A., Davie, G., Langley, J., & Fowler, C. (2009). NZIPS indicators of injury death: Are we counting all the cases? Proceedings of the Australasian Mortality Data Interest Group (AMDIG) Understanding Mortality Data Workshop: External Causes of Death. Retrieved from http://www.nchirt.qut.edu.au/consultancy/amdig/workshops/2010-Abstracts.jsp
Davie, G., Langley, J., Samaranayaka, A., & Wetherspoon, M.-E. (2009). Accuracy of injury coding under ICD-10-AM for New Zealand public hospital discharges. Australasian Epidemiologist. 16(2), (pp. 78). [Abstract]
Working Paper; Discussion Paper; Technical Report
Cryer, C., Lovelock, K., Lilley, R., Davidson, P., Davie, G., Samaranayaka, A., McBride, D., Milosavljevic, S., & Morgaine, K. (2009). Effective occupational health interventions in agriculture: Report of a survey of risk factors and exposures on farms [IPRU Report No. ORO76]. Dunedin, New Zealand: Injury Prevention Research Unit, Department of Preventive and Social Medicine, University of Otago. 169p.
2008
Journal - Research Article
dos Santos Dias, C. T., Samaranayaka, A., & Manly, B. (2008). On the use of correlated beta random variables with animal population modelling. Ecological Modelling, 215, 293-300.
Davie, G., Langley, J., Samaranayaka, A., & Weatherspoon, M. E. (2008). Accuracy of injury coding under ICD-10-AM for New Zealand public hospital discharges. Injury Prevention, 14, 319-323. doi: 10.1136/ip.2007.017954
Conference Contribution - Published proceedings: Abstract
Cryer, C., Samaranayaka, A., Davie, G., & Langley, J. D. (2008). Deriving a valid description of the epidemiology of serious non-fatal work-related injury: A demonstration project. Proceedings of the National Occupational Injury Research Symposium. Retrieved from http://www.cdc.gov/niosh/noirs/2008/abstracts2008.html
Cryer, C., Samaranayaka, A., Russell, D., Barson, D., Morgaine, K., Langley, J., & Davie, G. (2008). The effectiveness of the New Zealand FarmSafeTM programmes: Development and investigation of a method for outcome evaluation. Proceedings of the National Occupational Injury Research Symposium. Retrieved from http://www.cdc.gov/niosh/noirs/2008/abstracts2008.html
Commissioned Report for External Body
Cryer, C., Samaranayaka, A., Russell, D., Morgaine, K., Davie, G., Langley, J., & Barson, D. (2008). Pilot injury outcome evaluation of the effectiveness of the FarmSafe™ programmes for sheep, beef and dairy farmers - Parts 1 and 2. Commissioned by Accident Compensation Corporation of New Zealand. Dunedin, New Zealand: Injury Prevention Research Unit, Department of Preventive and Social Medicine, University of Otago. 176p.
2007
Working Paper; Discussion Paper; Technical Report
Cryer, C., Samaranayaka, A., Russell, D., Davie, G., & Langley, J. (2007). The epidemiology of serious non-fatal work-related traumatic injury: A demonstration project [IPRU Report No. OR068]. Dunedin, New Zealand: Injury Prevention Research Unit, Department of Preventive and Social Medicine, University of Otago. 82p.
2006
Awarded Doctoral Degree
Samaranayaka, A. (2006). Environmental stochasticity and density dependence in animal population models (PhD). University of Otago, Dunedin, New Zealand. 347p.
1997
Journal - Research Article
Samaranayaka, A., Engås, A., & Jørgensen, T. (1997). Effects of hanging ratio and fishing depth on the catch rates of drifting tuna gillnets in Sri Lankan waters. Fisheries Research, 29, 1-12.