Table 3.
Baseline demographics, smoking, and affective characteristics, by IRS group (n = 104).
| IRS group |
||
|---|---|---|
| Characteristic | IRS+ | IRS− |
| n (%) | ||
| Total n | 62 (59.6) | 42 (40.4) |
| Female | 17 (27.4) | 16 (38.1) |
| Positive depression history | 7 (11.3) | 5 (9.5) |
| MEAN (SD) | ||
| Age | 44.34 (11.2) | 44.95 (10.6) |
| Years of smoking | 24.60 (12.0) | 26.67 (10.8) |
| Cigarettes/day | 21.13 (8.4) | 21.79 (8.1) |
| Expired CO (ppm) | 23.85 (9.1) | 29.21 (15.42)a |
| FTND score | 4.71 (2.3) | 5.19 (2.2) |
| WISDM (total score) | 44.45 (10.2) | 46.35 (9.3) |
| CES-D (total score) | 7.52 (6.1) | 7.57 (6.2) |
| Depression proneness inventory | 2.61 (1.0) | 2.70 (1.1) |
| Fawcett–Clark Pleasure Scale | 3.68 (0.4) | 3.74 (0.3) |
| BAS | 26.97 (5.8) | 28.50 (4.8) |
| BIS | 14.89 (3.5) | 15.17 (2.9) |
a Significant t-test comparison, by IRS group, at α < 0.05 (uncorrected). CO, carbon monoxide; FTND, Fagerström test for nicotine dependence; WISDM, Wisconsin inventory of smoking dependence motives; CES-D, the center for epidemiologic studies’ depression scale; BAS, behavioral approach system; BIS, behavioral inhibition system.