Table 1.
Descriptive statistics of demographic and substance use variables at baseline by randomization groups (N=307).
| 1.IVR Daily (N=81) |
2.IVR Weekly (N=76) |
3.SMS Daily (N=81) |
4.SMS Weekly (N=69) |
Statistical test | |
|---|---|---|---|---|---|
| Agea | 24.49 (2.35) | 24.32 (2.69) | 24.33 (2.32) | 24.45 (2.33) | F(3,303)=0.10, p=0.96 |
| Male | 45.68% | 59.21% | 51.85% | 40.58% | X2(3)=5.72, p=0.13 |
| Black | 61.73% | 52.63% | 62.96% | 62.32% | X2(3)=2.27, p=0.52 |
| Public assistance | 70.51% | 55.41% | 67.09% | 69.57% | X2(3)=4.80, p=0.19 |
| Nicotine use | 70.37% | 73.68% | 58.02% | 65.22% | X2(3)=4.98, p=0.17 |
| Alcohol use | 77.78% | 60.53% | 66.67% | 69.57% | X2(3)=5.65, p=0.13 |
| Marijuana use | 72.84% | 73.68% | 67.90% | 76.81% | X2(3)=1.56, p=0.67 |
| Other illicit drug use | 13.58% | 9.21% | 7.41% | 17.39% | X2(3)=4.33, p=0.23 |
| Prescription drug misuse | 19.75% | 21.05% | 12.35% | 20.29% | X2(3)=2.61, p=0.46 |
a
Mean (standard deviation)