Table 1.
Mean, SD, t Value, and Chi-Square Value for Comparisons Between Group Means
| Measure (range) | Group | Hedge’s g | ||||
|---|---|---|---|---|---|---|
| Cocaine-using | Non-cocaine-using | |||||
| Mean | SD | Mean | SD | Test of significance | ||
| Age | 41.2 | (7.0) | 38.3 | (12.4) | t (38) = 0.9 | |
| Females | 8 | 12 | χ2 (1) = 1.6 | |||
| Race | χ2 (2) = 5.0 | |||||
| African American | 15 | 8 | ||||
| Caucasian | 4 | 10 | ||||
| Other | 1 | 2 | ||||
| Years of education | 12.1 | (1.2) | 12.5 | (1.0) | t (38) = 1.3 | |
| DAST (0–28) | 12.9 | (5.6) | 3.0 | (2.1) | t (38) = 7.4* | 2.3 |
| MAST (0 – 53) | 10.2 | (10.3) | 3.6 | (4.2) | t (38) = 2.7* | 0.8 |
| Cigarette use | ||||||
| Cigarettes per day | 15.7 | (4.7) | 16.1 | (4.3) | t (38) = 0.3 | |
| Minutes since last cigarettea | 192.5 | (244.3) | 146.3 | (193.9) | t (38) = 0.7 | |
| Carbon monoxide level | 18.5 | (10.9) | 17.1 | (8.6) | t (38) = 0.5 | |
| FTND (0–10) | 5.3 | (2.1) | 4.5 | (1.6) | t (38) = 1.4 | |
| MNWS (total) (0–60) | 5.4 | (5.3) | 8.7 | (7.7) | t (38) = 1.6 | |
| QSU (0–100) | ||||||
| Factor 1 | 73.9 | (30.4) | 69.3 | (27.0) | t (38) = 0.5 | |
| Factor 2 | 40.9 | (28.8) | 24.2 | (22.3) | t (38) = 2.1* | 0.6 |
| Cocaine use | ||||||
| Days since last use | 2.6 | (4.0) | ||||
| Days used past month | 12.8 | (6.1) | ||||
| Days used past 3 months | 38.9 | (21.3) | ||||
| Years used | 16.7 | (7.3) | ||||
DAST = Drug Abuse Screening Test; FTND = Fagerström Test of Nicotine Dependence; MAST = Michigan Alcoholism Screening Test; MNWS = Minnesota Nicotine Withdrawal Scale; QSU = Questionnaire of Smoking Urges-Brief. Effect size (Hedge’s g) reported for significant group differences.
aMinutes since last cigarette prior to start of session.
*Significant difference between groups, P < .05.