Table 2.

Chronic Obstructive Pulmonary Disease by PFT

Classification	n	M/Fa	Mean age	Race	Smoking status	Pack years	FEV1%d	FEV1/FVCe
			in years	C/AA/Otherb	current/former	smokedc
No COPD	133	65 / 68	62	113 / 16 / 4	46 / 87	45	80	0.78
COPD (all)	157	97 / 60	63	145 / 12 / 0	50 / 107	56	58	0.52
COPD (stage 1)	45	32 / 12	62	41 / 4 / 0	22 / 23	54	76	0.59
COPD (stage 2)	77	48 / 29	64	73 / 4 / 0	22 / 55	57	57	0.55
COPD (stage 3)	26	15 / 11	64	23 / 3 / 0	5 / 21	53	35	0.39
COPD (stage 4)	7	2 / 5	63	7 / 0 / 0	1 / 6	65	22	0.27
COPD (stage unknown)	2	1 / 1	66	1 / 1 / 0	0 / 2	66	-	0.57
Unknown	94	50 / 44	63	85 / 9 / 0	35 / 6 0	50	-	-

^aM = male, F = female

^bC = Caucasian, AA = African-American, Other = other race or race not reported

^cPack years = packs of cigarettes smoked per day x years of smoking

^dFEV1% = forced expiratory volume in 1 second, percent of expected

^eFEV1/FVC = FEV1/Forced Vital Capacity