Table 2.

Prevalence of COPD and classification parameters for questionnaire-based definitions.

Abbreviations: COPD, chronic obstructive pulmonary disease; BMI, body mass index; PPV, positive predictive value; NPV, negative predictive value

^aAccuracy is the proportion of true classifications (true positives + true negatives) among all classifications (true positives + true negatives + false positives + false negatives)