Table 3.
Modeled Means by Subgroups
| Days/Month of Cigarette Use | Days/Month of Alcohol Use |
Days/Month of Illicit Drug Use |
|||||
|---|---|---|---|---|---|---|---|
| Month | Mean | (SE) | Mean | (SE) | Mean | (SE) | |
| Primary Drug e-SBIRT |
0 | 25.7 | (0.6) | 21.5 | (2.3) | 21.1 | (1.5) |
| 1 | 23.8 | (0.8) | 17.4 | (1.9) | 16.5 | (1.6) | |
| 3 | 21.0 | (1.2) | 13.3 | (2.1) | 12.3 | (1.9) | |
| 6 | 19.0 | (1.5) | 13.4 | (2.4) | 12.9 | (1.9) | |
| SBIRT | 0 | 27.3 | (0.3) | 15.7 | (2.4) | 18.7 | (1.4) |
| 1 | 25.0 | (0.7) | 10.8 | (2.4) | 16.0 | (1.3) | |
| 3 | 22.0 | (1.1) | 6.9 | (2.8) | 13.2 | (1.7) | |
| 6 | 21.0 | (1.3) | 7.8 | (2.8) | 13.3 | (1.9) | |
| EUC | 0 | 27.0 | (0.4) | 15.1 | (2.0) | 21.0 | (1.4) |
| 1 | 26.2 | (0.5) | 11.4 | (1.4) | 19.2 | (1.4) | |
| 3 | 24.6 | (0.7) | 8.2 | (2.3) | 16.4 | (1.6) | |
| 6 | 22.7 | (1.1) | 9.2 | (2.4) | 14.2 | (1.9) | |
| Secondary Use e-SBIRT |
0 | 26.6 | (0.4) | 15.2 | (1.7) | 15.7 | (1.3) |
| 1 | 24.7 | (0.6) | 11.5 | (1.3) | 13.3 | (1.2) | |
| 3 | 22.0 | (0.9) | 8.0 | (1.2) | 10.8 | (1.4) | |
| 6 | 20.3 | (1.2) | 7.5 | (1.2) | 10.7 | (1.4) | |
| SBIRT | 0 | 27.1 | (0.3) | 11.5 | (1.2) | 18.2 | (1.2) |
| 1 | 25.0 | (0.5) | 8.3 | (1.1) | 15.5 | (1.1) | |
| 3 | 22.4 | (0.9) | 5.6 | (1.1) | 12.7 | (1.3) | |
| 6 | 21.5 | (1.0) | 6.0 | (1.3) | 12.4 | (1.5) | |
| EUC | 0 | 27.2 | (0.3) | 12.2 | (1.2) | 18.1 | (1.2) |
| 1 | 25.8 | (0.4) | 11.4 | (1.5) | 16.1 | (1.2) | |
| 3 | 23.8 | (0.7) | 9.7 | (1.8) | 13.6 | (1.3) | |
| 6 | 22.5 | (1.0) | 7.3 | (1.2) | 12.5 | (1.4) | |
Abbreviations: SE, standard error; e-SBIRT, electronically-delivered Screening, Brief Intervention, and Referral to Treatment; SBIRT, clinician-delivered Screening, Brief Intervention, and Referral to Treatment; EUC, Enhanced Usual Care
Note: Means were modeled using generalized estimating equation models predicting days per month of substance use among primary substance and at-risk use subgroups. Models were adjusted for treatment group, linear and quadratic effects of time, treatment × (linear and quadratic) time interactions, and pregnancy status.