General characteristics of the study population at baseline and follow-up.
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Differences between baseline and follow-up are tested for statistical differences: paired t-test for continuous variables, McNemar’s paired chi squared test for binary outcomes. The number of persons included in each analysis depends on the source of the outcome data: questionnaire (n = 234), lung function (n = 161), or serological data (n = 212).
创建时间：
2017-12-07
