Table 1.
Demographic and Smoking Characteristics of DP– and DP+ for the Full Sample (n = 87) and for the Subset Matched for Age and Sex (n = 68)
| DP+ (n = 34) |
DP– (n = 53) |
DP– matched for age and sex (n = 34) |
||||||
|---|---|---|---|---|---|---|---|---|
| Covariate | Mean | SD | Mean | SD | p valuea | Mean | SD | p valueb |
| Age | 34.3 | 13.7 | 41.03 | 14.4 | 0.03 | 36.8 | 14.4 | 0.46 |
| Smoking rate | 17.7 | 6.7 | 17.4 | 10.1 | 0.89 | 17.4 | 10.1 | 0.73 |
| Nicotine dependence | 5.81 | 1.53 | 5.54 | 1.79 | 0.45 | 5.54 | 1.79 | 0.09 |
| Baseline CO (ppm) | 21.7 | 10.5 | 20.2 | 11.6 | 0.73 | 20.2 | 11.6 | 0.99 |
| CESD | 31.3 | 10.9 | 7.3 | 5.3 | <0.001 | 7.3 | 5.3 | <0.001 |
| IDD | 41.1 | 7.3 | 6.1 | 8.1 | <0.001 | 7.5 | 8.5 | <0.001 |
| Withdrawal symptoms | ||||||||
| Abstinent | 19.9 | 7.0 | 9.2 | 6.4 | <0.001 | 10.2 | 6.9 | <0.001 |
| Ad-lib smoking | 13.4 | 7.4 | 6.4 | 4.5 | <0.001 | 6.6 | 4.6 | <0.001 |
| % | Count | % | Count | % | Count | |||
|---|---|---|---|---|---|---|---|---|
| Sex (female) | 44% | (15) | 26% | (14) | 0.09 | 41% | (14) | 0.81 |
| Race | 0.57 | 0.74 | ||||||
| American Indian | 0 | (0) | 2% | (1) | 3% | (1) | ||
| Asian | 3% | (1) | 0 | (0) | 0 | (0) | ||
| Black | 47% | (16) | 57% | (30) | 47% | (16) | ||
| White | 47% | (16) | 40% | (21) | 47% | (16) | ||
| More than one race | 3% | (1) | 2% | (1) | 3% | (1) |
Note. CESD = Center for Epidemiological Studies on Depression Scale.
a
p value represents main effect of group for full sample (n = 87).
b
p value represents main effect of group for sample matched for age and sex (n = 68).