The present study focuses on cross-sectional analyses using the 2008 Korean Longitudinal Study of Ageing, which was conducted with Korean men and women aged 45 years or older. The sample for this study was 4040 individuals who indicated they were 65 years old or older. The survey design was a 2-stage stratified cluster sampling framed by the national population and housing census.
For the analysis, the sample was weighted to reflect the population of the nation. To account for design effects created by stratified multistage cluster sampling, weights and strata were used in the estimation.