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Dataset: Korean Longitudinal Study of Ageing (KLoSA)

Basic Information
Dataset Full Name Korean Longitudinal Study of Ageing
Dataset Acronym KLoSA
Summary

The Korean Longitudinal Study of Ageing 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 strengthSelf-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.
  • High retention rates (~80%) between waves.
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 including 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:

    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
Similar/Related Dataset(s)

Other longitudinal ageing studies:

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://synapse.koreamed.org/search.php?where=aview&id=10.4306/pi.2016.13.5.473&code=0162PI&vmode=FULL

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

Access to documents below require registration:

Userguide:

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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The Rehabilitation Research Cross-dataset Variable Catalog has been developed through the Center for Large Data Research & Data Sharing in Rehabilitation (CLDR). The Center for Large Data Research and Data Sharing in Rehabilitation involves a consortium of investigators from the University of Texas Medical Branch, Cornell University's Yang Tan Institute (YTI), and the University of Michigan. The CLDR is funded by NIH - National Institute of Child Health and Human Development, through the National Center for Medical Rehabilitation Research, the National Institute for Neurological Disorders and Stroke, and the National Institute of Biomedical Imaging and Bioengineering. (P2CHD065702).

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