D J Myall1, T L Pitcher2, J F Pearson3, J C Dalrymple-Alford4, T J Anderson5, M R MacAskill2. 1. New Zealand Brain Research Institute, 66 Stewart St, Christchurch 8011, New Zealand. Electronic address: daniel.myall@nzbri.org. 2. New Zealand Brain Research Institute, 66 Stewart St, Christchurch 8011, New Zealand; Department of Medicine, University of Otago, PO Box 4345, Christchurch, New Zealand. 3. Biostatistics and Computational Biology Unit, University of Otago, PO Box 4345, Christchurch, New Zealand. 4. New Zealand Brain Research Institute, 66 Stewart St, Christchurch 8011, New Zealand; Department of Medicine, University of Otago, PO Box 4345, Christchurch, New Zealand; Department of Psychology, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand; Brain Research, New Zealand. 5. New Zealand Brain Research Institute, 66 Stewart St, Christchurch 8011, New Zealand; Department of Medicine, University of Otago, PO Box 4345, Christchurch, New Zealand; Brain Research, New Zealand; Department of Neurology, Christchurch Hospital, Private Bag 4710, Christchurch 8140, New Zealand.
Abstract
BACKGROUND: Traditionally the risk of Parkinson's has been considered to increase monotonically with age, although there is evidence that prevalence and incidence may decrease in the oldest old. To examine this further we estimated the national prevalence and incidence of Parkinson's in New Zealand, using drug-tracing methods, to examine the relationship of Parkinson's with sex and age up to 100+. METHODS: Information on Parkinson's-related medications was extracted from the national pharmaceutical database of community-dispensed medications from 2005 to 2014. Diagnoses for a large subset of individuals were independently determined through national mortality and hospital admissions datasets. We used a Bayesian model, accommodating diagnostic uncertainty and bias, to estimate the number of people with Parkinson's. RESULTS: The 2013 prevalence of Parkinson's in New Zealand was 210 per 100 000 population (95% uncertainty interval 208-212) with age-standardized prevalence rates higher for males (ratio 1.6:1). Incidence was 31 per 100 000 person-years (95% uncertainty interval 30-32), also higher in males (ratio 1.8:1). Incidence and prevalence by age increased exponentially until 75 years, peaked at 85 years, and then dropped sharply. CONCLUSIONS: The prevalence of Parkinson's in New Zealand is expected to double over a 25-year period but then increase at a slower rate due to the drop-off in prevalence and incidence in the oldest old. The findings suggest that Parkinson's disease is not an aging-dependent but an age-dependent disorder.
BACKGROUND: Traditionally the risk of Parkinson's has been considered to increase monotonically with age, although there is evidence that prevalence and incidence may decrease in the oldest old. To examine this further we estimated the national prevalence and incidence of Parkinson's in New Zealand, using drug-tracing methods, to examine the relationship of Parkinson's with sex and age up to 100+. METHODS: Information on Parkinson's-related medications was extracted from the national pharmaceutical database of community-dispensed medications from 2005 to 2014. Diagnoses for a large subset of individuals were independently determined through national mortality and hospital admissions datasets. We used a Bayesian model, accommodating diagnostic uncertainty and bias, to estimate the number of people with Parkinson's. RESULTS: The 2013 prevalence of Parkinson's in New Zealand was 210 per 100 000 population (95% uncertainty interval 208-212) with age-standardized prevalence rates higher for males (ratio 1.6:1). Incidence was 31 per 100 000 person-years (95% uncertainty interval 30-32), also higher in males (ratio 1.8:1). Incidence and prevalence by age increased exponentially until 75 years, peaked at 85 years, and then dropped sharply. CONCLUSIONS: The prevalence of Parkinson's in New Zealand is expected to double over a 25-year period but then increase at a slower rate due to the drop-off in prevalence and incidence in the oldest old. The findings suggest that Parkinson's disease is not an aging-dependent but an age-dependent disorder.
Authors: Prashanna Khwaounjoo; Gurleen Singh; Sophie Grenfell; Burak Özsoy; Michael R MacAskill; Tim J Anderson; Yusuf O Çakmak Journal: Sensors (Basel) Date: 2022-06-18 Impact factor: 3.847
Authors: Campbell Le Heron; Michael MacAskill; Deborah Mason; John Dalrymple-Alford; Tim Anderson; Toni Pitcher; Daniel Myall Journal: Mov Disord Date: 2021-08-10 Impact factor: 9.698