Table 3.

Changes in FEV₁ values at baseline and at 12 months

GOLD Status	Non-Quitter					Quitter
	n	Baseline	12-month	Δ, L	p	n	Baseline	12-month	Δ, L	p
Stage-0	36	3.14±0.79	3.05±0.78	−0.08	<0.001	29	3.08±0.73	3.18±0.72	+0.10	<0.001
Stage-I	14	2.62±0.65	2.55±0.64	−0.07	<0.001	5	2.94±0.68	3.05±0.69	+0.11	<0.001
Stage-II	11	1.88±0.49	1.82±0.50	−0.06	<0.001	10	2.02±0.63	2.11±0.62	+0.09	<0.001
Stage-III	8	0.96±0.27	0.92±0.28	−0.04	0.10	9	1.00±0.14	1.08±0.13	+0.08	<0.001
Stage-IV	11	0.65±0.13	0.61±0.14	−0.04	<0.001	15	0.62±0.13	0.71±0.15	+0.09	<0.001
Total	80	2.32±1.14	2.24±1.12	−0.08	<0.001	68	2.10±1.19	2.19±1.20	+0.09	<0.001

Mean (median)±SD; Δ, change; L: liters