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Rehabilitation Dataset Directory: Dataset Profile

Dataset: Korean Longitudinal Study of Aging (KLoSA)

Basic Information
Dataset Full Name	Korean Longitudinal Study of Aging
Dataset Acronym	KLoSA
Summary	The Korean Longitudinal Study of Aging is an ongoing nationally representative longitudinal study of the South Korean household population 45 years and older. Sampling was based on a multistage stratified probability framework for each census district. The first survey was conducted in 2006 and participants are followed every 2 years. The primary purpose of the study is to collect data that will assist in implementing social and economic policies for the aging population.
Key Terms	Aging, Longitudinal, Health, Health care utilization, Disability Social participation, Social networks, Diet Health risk behaviors, Chronic diseases, Life expectancy Cognitive and Mental health, Depression Employment and Income
Study Design	Longitudinal
Data Type(s)	Survey
Sponsoring Agency/Entity	Korea Labor Institute
Health Conditions/Disability Measures
Health Condition(s)	Arthritis, Autism spectrum disorders, Body mass index (BMI)/obesity,, Cancer, Cardiovascular conditions, Depression, Diabetes, Eye diseases, Heart attack, Kidney/renal condition, Pulmonary disorders, Stroke, Traumatic Brain Injury (TBI)
Disability Measures	Functional limitations (ADLs and/or IADLs), Hearing disability, Mental health disability, Physical disability, Visual disability, Work limitation Speech disability, Grip strength, Self-rated Health, K-MMSE (Korean Mini Mental State Exam), Korean version of CES-D, Subjective Life Expectancy (SLE), Cognitive function
Measures/Outcomes of Interest
Topics	Health risks, Life expectancy, Health trajectories Cognitive and physical decline Social engagement and mental health Effects of socioeconomic disparities on health Subjective expectations and satisfaction Employment, and economic well-being
Sample
Sample Population	Community-dwelling adults over 45 years living in South Korea Institutionalized persons, who were excluded from the first wave, will be included in the second wave of the main survey.
Sample Size/Notes	10,254 at baseline (2006) 7,000 in most recently released wave
Unit of Observation	Individual
Continent(s)	Asia
Countries	Korea
Geographic Coverage	National, (not including Jeju Island)
Geographic Specificity	Region
Special Population(s)	Aging/Older people
Data Collection
Data Collection Mode	Computer assisted personal interviews (CAPI)
Years Collected	2006-present (ongoing)
Data Collection Frequency	Every 2 years
Strengths and Limitations
Strengths	Nationally representative sample of the South Korean population. Ideal for longitudinal analyses of health risk behaviors and self-perceived life expectancy on health and disability. Some outcome measures are comparable with other national longitudinal aging studies including the Health and Retirement Study (HRS) See below for related datasets. High retention rates (~80%) between waves. Wave 7 includes a psychosocial section as well as data regarding binge drinking, usage of long-term care insurance, and cognition orientation to time and place (see Harmonized KLoSA) A harmonized End of Life file is available that includes variables specific to the respondent's death and end of life, including health conditions, caregiving received, healthcare utilization, cognition, wealth, and employment status between the respondent's last interview and time of death. (Harmonized KLoSA End of Life)
Limitations	Health conditions and disability primarily self-reported . Several outcome measures used cannot be directly compared with other studies, but are tailored to the Korean population. Sample consists only of community-dwelling adults, limiting generalizability and introducing selection bias risk. Wave 1 documentation states that Wave 2 will include a sample of the institutionalized population, however such a sample is not obvious in codebooks or more recent documentation.
Data Details
Primary Website	Main site (note: site may not work with all browsers): http://survey.keis.or.kr/eng/klosa/klosa01.jsp Gateway to Global Aging site also contains significant information on KLoSA including codebooks, harmonizing code and other useful resources: https://g2aging.org/?section=study&studyid=5
Data Access	Data access requires registration on main site first : http://survey.keis.or.kr/eng/klosa/klosa01.jsp Data download page (after main site registration) here: http://survey.keis.or.kr/eng/klosa/databoard/List.jsp
Data Access Requirements	Data use agreement, No cost
Summary Tables/Reports	Basic Analysis Report of the Korea Labor and Income Panel Study (2006): https://www.kli.re.kr/kli_eng/engRsrchReprtView.do?key=382&pblctListNo=6533
Data Components	Each individual wave includes both a main file and an imputation file Wave 1 Wave 2 Wave 3 Wave 4 Wave 5 Wave 6 Wave 7
Similar/Related Dataset(s)	Other longitudinal aging studies: Canadian Longitudinal Study on Aging (CLSA) English Longitudinal Study of Ageing (ELSA) Health and Retirement Study (HRS) - U.S. Japanese Study of Aging and Retirement (JSTAR) Longitudinal Aging Study in India (LASI) Mexican Health and Aging Study (MHAS) Survey of Health, Ageing and Retirement in Europe (SHARE) World Health Organization Study on global Ageing and adult health (SAGE)
Selected Papers
Other Papers	Publication list (select survey=KLoSA) https://g2aging.org/?section=papers Gender-Specific Incidence and Predictors of Cognitive Impairment among Older Koreans: Findings from a 6-Year Prospective Cohort Study https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5067340/ Socioeconomic Disparity in Later-Year Group Trajectories of Depressive Symptoms: Role of Health and Social Engagement Change. https://www.ncbi.nlm.nih.gov/pubmed/28587183
Technical	Codebook/survey (accessible without registration): https://g2aging.org/?section=study&studyid=5 Gateway to Global Aging provides Stata creation code that can create a harmonized KLoSA dataset: Stata Creation Code Harmonized KLoSA codebook Harmonized KLoSA End of Life codebook Access to documents below require registration: User guide: http://survey.keis.or.kr/eng/klosa/userguide/List.jsp Codebooks http://survey.keis.or.kr/eng/klosa/codebook/List.jsp

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