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. 2016 Apr 15;11:775–783. doi: 10.2147/COPD.S95954

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© 2016 Lee et al. This work is published and licensed by Dove Medical Press Limited

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Study flow chart and outcome assessment flow using KNHANES and NHI reimbursement database.

Note: Vertical arrows in the rectangle box indicate the year of enrollment from KNHANES. Dashed arrows in the rectangle box represent the retrospective assessment of NHI data and solid arrows in the rectangle box represent the prospective assessment of NHI data.

Abbreviations: FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity; KNHANES, Korean National Health and Nutrition Examination Survey; NHI, National Health Insurance.