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Methods Validation of self-reported morbidities of the Korean Atomic Bomb Survivor Cohort
Ansun Jeong1orcid , Thi Xuan Mai Tran2orcid , Seong-geun Moon2orcid , Mi Kyung Kim2orcid , Inah Kim3orcid , Yu-Mi Kim2orcid , Boyoung Park2orcid
Epidemiol Health 2024;e2024058
DOI: https://doi.org/10.4178/epih.e2024058 [Accepted]
Published online: June 28, 2024
1Department of Health Sciences, Hanyang University, Seoul, Korea, Seoul, Korea
2Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea, Seoul, Korea
3Department of Occupational and Environmental Medicine, Hanyang University College of Medicine, Seoul, Korea, Seoul, Korea
Corresponding author:  Boyoung Park,
Email: hayejine@hanmail.net
Received: 14 February 2024   • Revised: 24 May 2024   • Accepted: 3 June 2024
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OBJECTIVES
This study aimed to evaluate the agreement of disease status collected through a survey of the Korean Atomic Bomb Survivor Cohort (K-ABC), compared with medical claim records from the Korean National Health Insurance Service (NHIS) database and the Korean Central Cancer Registry (KCCR).
METHODS
Data on the lifetime physician-diagnosed morbidities of 1,215 K-ABC participants were collected through an interviewer-administered questionnaire between 2020 and 2022. Survey data were linked to the NHIS and KCCR databases. Eleven diseases were included for validation. We evaluated the following indicators: sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), accuracy, the area under the curve (AUC), and the kappa coefficient.
RESULTS
The mean (standard deviation) age was 62.1 (18.7) years, and 42.6% of the participants were aged ≥70 years. Hypertension and cataracts showed the highest prevalence rates (33.8% and 28.8%, respectively). Hypertension, diabetes, and cancer demonstrated high sensitivity (>0.8) and specificity (>0.9), whereas diabetes, cancer, myocardial infarction, angina pectoris, and asthma exhibited high accuracy (>0.9). In contrast, arthritis, allergic rhinitis, and asthma showed low sensitivity (<0.4) and kappa values (<0.3). In the participants aged ≥70 years, the kappa value was ≥0.4 for all diseases except arthritis, allergic rhinitis, and asthma.
CONCLUSIONS
The results from this initial analysis showed relatively high agreement between the survey and NHIS/KCCR databases, especially for hypertension, diabetes, and cancer. Our findings suggest that the information on morbidities collected through the questionnaires in this cohort was valid for both younger and older individuals.


Epidemiol Health : Epidemiology and Health