Subjects' characteristics at baseline and follow-up at 4 years (n = 575).
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SD = standard deviation, COPD = chronic obstructive pulmonary disease, P-Values were outcomes of paired t-tests for continuous variables, and of McNemar tests for binary variables. Subjects' characteristics at baseline and follow-up at 4 years (n = 575).
创建时间：
2015-07-15
