Table 1.
Participant Characteristics
| Variable | Overall sample(N = 124) | Methadone condition(n = 67) | Buprenorphine condition(n = 57) | Test statistic | p Value |
|---|---|---|---|---|---|
| Mean age in years (SD) | 26.4 (5.4) | 27.2 (5.4) | 25.4 (5.2) | t = 1.94; df = 122 | p = .054 |
| Black (%) | 8.1 | 10.4 | 5.2 | χ2 = 1.12; df = 1 | p = .29 |
| Not married (%) | 87.1 | 83.6 | 91.2 | χ2 = 4.99; df = 4 | p = .29 |
| Unemployed (%) | 83.1 | 86.6 | 78.9 | χ2 = 2.05; df = 2 | p = .36 |
| Mean EGAa weeks (SD) | 18.26 (5.99) | 18.03 (6.5) | 18.53 (5.4) | t = 0.46; df = 122 | p = .65 |
| Report cigarette smoking past month (%) | 95 | 97 | 93 | χ2 = 1.09; df = 1 | p = .30 |
| Mean age of first cigarette smoking (SD) | 14.4 (2.8) | 14.6 (2.6) | 14.1 (3.0) | t = 0.95; df = 120 | p = .34 |
| Mean months of lifetime cigarette smoking (SD) | 128.1 (75.9) | 137.7 (70.9) | 116.5 (8.06) | t = 1.55; df = 121 | p = .12 |
| Mean days cigarette smoking past month (SD) | 27.8 (7.1) | 28.9 (5.2) | 26.5 (8.8) | t = 1.90; df = 122 | p = .06 |
| Adjusted CPDb past month (SD) | 13.1 (8.09) | 13.99 (8.15) | 12.07 (7.96) | t = 1.32; df = 122 | p = .189 |
| Mean Tobacco Dependence Score (SD) | 7.3 (3.7) | 7.3 (3.8) | 7.2 (3.7) | t = 0.09; df = 115 | p = .93 |
aEGA represents the estimated gestational age of pregnancy measured in weeks.
bAdjusted CPD represents the product of number of days smoked in the past 30 days and number of cigarettes per day divided by 30.