Table 1.

Percent distribution (%) of current and ex-smokers in the cross-sectional analysis, according to selected characteristics collected at baseline.

	N	Current smokers at baseline (%)	Ex-smokers at baseline (%)
Total (N)	3050	2273	777
Sex
Men	2123	66.3	79.1
Women	927	33.7	20.9
p-valuea		<0.001
Age (years)
<54	812	28.5	21.0
54–57	764	26.1	22.0
58–61	722	23.5	24.2
≥62	752	21.9	32.8
p-valuea		<0.001
FEV1 (%)
<80	479	17.4	14.6
80–99	1122	40.4	35.4
≥100	1271	42.2	50.0
Missing	178
p-valuea		0.001
BMI (kg/m2)
<18.5	30	2.0	0.5
18.5–24.9	798	43.9	31.3
25.0–29.9	888	42.7	47.9
≥30	285	11.4	20.3
Missing	1049
p-valuea		<0.001
Pack-years
<40	1484	46.9	53.8
≥40	1566	53.1	46.2
p-valuea		0.001

^aDifferences between current and ex-smokers were tested using chi-square tests.