The Egyptian Journal of Bronchology

Table 7 Mean Δ differences of forced expiratory volume in first second (FEV1) and forced vital capacity (FVC) based on GOLD stage

From: Diagnostic performance of lung volumes in assessment of reversibility in chronic obstructive pulmonary disease

	Mean ± SD	P value
Δ FEV1 (L)
GOLD I	0.09 ± 0.11	0.01
GOLD II	0.06 ± 0.18
GOLD III	0.04 ± 0.21
GOLD IV	0.03 ± 0.18
Δ FVC (L)
GOLD I	0.03 ± 0.08	0.03
GOLD II	0.04 ± 0.10
GOLD III	0.05 ± 0.20
GOLD IV	0.08 ± 0.19

FEV1 forced expiratory volume in first second, FVC forced vital capacity
Data expressed as frequency (percentage)
P value was significant if < 0.05

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