| Gender (M/F, No.) |
39/21 |
40/20 |
-† |
| Age (yrs, mean±SD) |
46.1±10.7 |
46.7±9.4 |
0.123# |
| Smokeyears (mean±SD) |
28.9±11.7 |
29.3±7.9 |
0.151# |
| Cigarette/day at enrolment (No., median and IQ) |
26.3 (20.0-30.0) |
24.5 (18.0-30.0) |
0.295§ |
| No. of pack/yr (median and IQ) |
37.8 (25.5-48.7) |
34.3 (25.1-47.5) |
0.367§ |
| Exhaled CO (ppb, mean±SD) |
30.4±15.8 |
28.3±12.4 |
0.234# |
| Age at initiation (yrs, mean±SD) |
17.4±5 |
16±5 |
0.626# |
| BDI (mean±SD) |
22.8±4.3 |
22.5±3 |
0.677# |
| FTCD (median and IQ) |
7.0 (6.0-8.0) |
6.5 (4.5-7.0) |
0.051§ |
| GN-SBQ (median and IQ) |
20.0 (15.0-33.0) |
20.0 (15.0-32.0) |
0.848§ |