Table 5.

Prevalence of chronic obstructive pulmonary disease by smoking status

		Smoking Status
		Never smoker (551)	Former/Current smoker (395)	Overall (946)	p
Stage I or higher					0.003
Yes	N	58	68	126
	%	10.5	17.2	13.3
No	N	493	327	820
	%	89.5	82.8	86.7
Stage II or higher					0.010
Yes	N	29	38	67
	%	5.3	9.6	7.1
No	N	522	357	879
	%	94.7	90.4	92.9