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

Table 4 Clinical characteristics of participants

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%

ISSN: 1756-0500