Abstract
OBJECTIVESIn South Korea, there are two nationwide health surveys conducted by the Korea Centers for Disease Control and Prevention: the Korea Community Health Survey (KCHS) and Korea National Health and Nutrition Examination Survey (KNHANES). The two surveys are directly comparable, as they have the same target population with some common items, and because both surveys are used in various analyses, identifying the similarities and disparities between the two surveys would promote their appropriate use. Therefore, this study aimed to compare the estimates of six variables in KCHS and eight variables in KNHANES over a six-year period and compare time series stability of region-specific and sex- and age-specific subgroup estimates.METHODSData from adults aged 19 years or older in the 2010-2015 KCHS and KNHANES were examined to analyze the differences of estimates and 95% confidence interval for self-rated health, current smoking rate, monthly drinking rate, hypertension diagnosis rate, diabetes diagnosis rate, obesity prevalence, hypertension prevalence, and diabetes prevalence. The variables were then clustered into subgroups by city as well as sex and age to assess the time series stability of the estimates based on mean square error.RESULTSWith the exception of self-rated health, the estimates taken based on questionnaires, namely current smoking rate, monthly drinking rate, hypertension diagnosis rate, and diabetes diagnosis rate, only differed by less than 1.0%p for both KCHS and KNHANES. However, for KNHANES, estimates taken from physical examination data, namely obesity prevalence, hypertension prevalence, and diabetes prevalence, differed by 1.9-8.4%p, which was greater than the gap in the estimates taken from questionnaires. KCHS had a greater time series stability for subgroup estimates than KNHANES.CONCLUSIONSWhen using the data from KCHS and KNHANES, the data should be selected and used based on the purpose of analysis and policy and in consideration of the various differences between the two data.
Highlights
Public health questionnaire surveys are the foundation of mod ern epidemiology and play an important role in devising policies and programs for the promotion of public health and prevention of diseases [1]
The two classic public health surveys conducted in South Korea are Korea Community Health Survey (KCHS) and Korea National Health and Nutrition Examination Survey (KNHANES) controlled by the Korea Centers for Disease Control and Prevention (KCDC)
With the exception of self-rated health, all estimates measured based on questionnaires, namely current smoking rate, monthly drinking rate, hypertension diag nosis rate and diabetes diagnosis rate, showed an absolute differ ence of less than 1.0%p and relative difference ranging from 1.99.0%p
Summary
Public health questionnaire surveys are the foundation of mod ern epidemiology and play an important role in devising policies and programs for the promotion of public health and prevention of diseases [1]. These surveys are conducted periodically, and ac curate health survey data are highly useful for understanding the scope and trends of health problems [2]. KNHANES com putes national statistics for people’s health, health-related aware ness and behavior, and food and nutrition intake and is used for goal-setting and assessment of the Health Plan. They share many survey items the two sur veys serve different purposes
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