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Table 4 Clinical characteristics of participants

From: Case-finding of chronic obstructive pulmonary disease with questionnaire, peak flow measurements and spirometry: a cross-sectional study

Variable COPD (n = 68) Normal lung function (n = 457) p
FEV1 pre-BD, mean ± SD 1.9 (±SD 0.6) 2.7 (SD 0.6) < 0.001
FVC pre-BD, mean ± SD 3.2 (±SD 1.0) 3.1 (SD 1.0) 0.700
FEV1/FVC pre-BD, mean ± SD 0.60 (±SD 0.09) 0.86 (SD 0.09) < 0.001
PEFR pre-BD, mean ± SD 208.9 (±SD 146.0) 502.1 (SD 220.7) < 0.001
Severity of airflow limitation, %    
 Mild 33.3% - -
 Moderate 55.5%
 Severe 11.1%
 Very Severe 0.0%
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