Fig. 4
From: Association between FEV1/FVC levels and all-cause mortality in the general population
Non-linear association between FEV1/FVC and all-cause mortality. The solid curved line represents the estimates for the association of FEV1/FVC and all-cause mortality. Shaded areas represent 95% confidence intervals. (A) Unadjusted RCS curves; (B) Adjusted RCS curves: adjusted for age, sex, Body mass index, race, smoking status, and comorbidities (congestive heart failure, stroke, asthma, chronic bronchitis, emphysema, cancer, diabetes, and hypertension). Abbreviations: FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity; RCS=the restricted cubic spline