• Jung Yeon Lee, Yong Il Hwang, Yong Bum Park, Jae Yong Park, Ki Uk Kim, Yeon-Mok Oh, Hyoung Kyu Yoon, Ho Il Yoon, Sueng Su Sheen, Sang Yeub Lee, Chang-Hoon Lee, Heung Bum Lee, Sung Chul Lim, Sung Soo Jung, Kyungwon Oh, Yuna Kim, Chaemin Chun, and Kwang Ha Yoo.
• Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, Konkuk University Medical Center, Chungju Hospital, Chungju, Korea.
• J. Korean Med. Sci. 2015 Jun 1; 30 (6): 725-32.

AbstractThe aim of the study was to evaluate the prevalence of restrictive ventilatory defect and to determine the risk factors in subjects with spirometrically-defined restrictive ventilatory defect. We used the population-based, fourth-2, 3 (2008, 2009) and fifth (2010-2012) Korea National Health and Nutrition Examination Survey (KNHANES) to analyze 15,073 subjects, aged ≥40 yr who underwent spirometry. Chest radiographs were also analyzed to identify restrictive lung disease. Spirometrically-defined restrictive ventilatory defect (FEV1/FVC≥70% and FVC<80% of mean predicted value) was detected in 11.3% (n= 1,709) of subjects aged ≥40 yr. The prevalence increased to 12.3% on using the lower limit of normal (LLN) criteria. Approximately 99.4% of subjects were classified as mild restrictive. Among these, 11.3% had inactive tuberculosis (TB) lesion, 2.2% cardiac disease, 2.0% previous operation scar or radiation injury and/or mediastinal disease, and 7.4% other pulmonary disease suggestive of restrictive lung diseases on chest radiograph. Evidence of previous TB history was independently associated with restrictive ventilatory defect (odds ratios [OR], 1.78; 95% confidence interval, 1.45-2.18) after adjustment for gender, age, smoking, area for residence and body mass index. The prevalence of restrictive ventilatory defect among the nationwide population in Korea was 11.3% with fixed ratio criterion and 12.3% with LLN criterion. Most cases were of the mild restrictive category and previous TB history is the independent risk factor for restrictive ventilatory defect.

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