Premium
An 8‐year comparison of dementia prevalence in Korea: Results from the nationwide survey on dementia epidemiology of Korea, 2008 and 2016
Author(s) -
Kim Ki Woong,
Suh Seung Wan,
Kim You Joung
Publication year - 2020
Publication title -
alzheimer's and dementia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.713
H-Index - 118
eISSN - 1552-5279
pISSN - 1552-5260
DOI - 10.1002/alz.041839
Subject(s) - dementia , epidemiology , medicine , prevalence , cohort , demography , cohort study , gerontology , disease , pediatrics , sociology
Background In many high‐income countries, the prevalence of dementia had been reduced over the past one or two decades. We investigated whether the prevalence of dementia had changed over the past 8 years in Korea. Method We had conducted the Nationwide Survey on Dementia Epidemiology of Korea (NaSDEK) in 2008 and 2016 on the Koreans aged 65 years or older who were randomly sampled from 15 administrative districts across the nation. We employed a two‐stage design; a screening phase using MMSE and a diagnostic phase using the Consortium to Establish a Registry for Alzheimer’s Disease Assessment Packet. We used inverse probability weighting methods to estimate dementia prevalence adjusting for the sampling fraction and the response rate at each phase. Result In the NaSDEK 2008, 8,199 were sampled, and 6,141 and 1,673 participated in the screening and diagnostic phases, respectively. In the NaSDEK 2016, 5,056 were sampled, and 3,703 and 551 participated in the screening and diagnostic phases, respectively. According to the NaSDEK 2008, the prevalence of dementia in 2017 was estimated to be 13.7% (967,828). However, the NaSDEK 2016 revealed that the prevalence of dementia in 2017 would be 10.5%, (741,977), which was reduced than expected by the NaSDEK 2008 (OR 0.739, 95% CI 0.737‐0.742, p <.001). Conclusion A cohort effect of dementia prevalence was also found in Korea, with earlier‐born individuals having a higher risk of prevalent dementia than their later‐born counterparts.