Spirometry variables in subjects recruited in the study.

Table 2: Spirometry variables in subjects recruited in the study.

Pulmonary function test
Variable	Moderate COPD	Severe COPD	Very severe COPD	p value
FEV1 (l)	62.4 ± 10.6	39.2 ± 5.2	27.5 ± 12.7	0.001^*
FVC (l)	74.8 ± 16.1	57.2 ± 9.9	45.6 ± 14.7	0.001^*
FEV1/FVC (%)	87.8 ± 15.4	72.3 ± 11.1	62.2 ± 13.1	0.001^*
PEFR (l)	30.0 (9.0 - 108.0)	20.0 (11.0 - 50.0)	12.0 (0.0 - 46.0)	0.001^*
MEF25-75 (l/s)	48.0 (9.0 - 94.0)	26.5 (10.0 - 56.0)	19.0 (7.0 - 93.0)	0.001^*

^*: Statistically significant.