Table 4.
Random effect model coefficients for change in drinking between baseline and 3- and 12-month follow-up, by injury statusa
| Interceptb (assess at baseline) | Group effect at baseline (intervention vs assess) | Time effect (3-month vs baseline) | Time effect (12-month vs baseline) | Interaction (3-month × intervention) | Interaction (12-month × intervention) | |
|---|---|---|---|---|---|---|
| Injured patients (N = 223 at baseline) | ||||||
| Primary outcomes | ||||||
| Days of 5+/4+ men/women last 28-day | 0.98 (0.19) | 0.03 (0.11) | −0.49 (0.10)*** | −0.18 (0.10)† | −0.09 (0.14) | −0.27 (0.14)* |
| Any RAPS4 positive last 3 months | −0.56 (0.66) | 0.24 (0.38) | −1.33 (0.39)*** | −1.95 (0.45)*** | 0.14 (0.55) | −0.01 (0.61) |
| Secondary outcomes | ||||||
| No. of drinking days per week last 28-day | 0.49 (0.10) | 0.06 (0.06) | −0.21 (0.06)*** | 0.05 (0.06) | −0.09 (0.09) | −0.18 (0.09)* |
| Drinks per drinking day last 28-day | 1.59 (0.18) | −0.05 (0.11) | −0.65 (0.10)*** | −0.63 (0.10)*** | 0.03 (0.14) | −0.06 (0.14) |
| Maximum drinks last 28-day | 1.84 (0.21) | −0.03 (0.13) | −0.75 (0.11)*** | −0.67 (0.11)*** | −0.02 (0.16) | −0.07 (0.16) |
| SIPs + 6 count last 3 months | 1.20 (0.18) | 0.00 (0.11) | −0.72 (0.09)*** | −0.57 (0.10)*** | −0.07 (0.14) | −0.14 (0.14) |
| Non-injured patients (N = 395 at baseline) | ||||||
| Primary outcomes | ||||||
| Days of 5+/4+ men/women last 28-day | 0.52 (0.13) | 0.05 (0.08) | −0.38 (0.07)*** | −0.30 (0.07)*** | −0.14 (0.10) | −0.28 (0.10)** |
| Any RAPS4 positive last 3 months | −1.51 (0.55) | 0.14 (0.30) | −0.71 (0.30)* | −1.55 (0.33)*** | −0.70 (0.43) | −0.27 (0.46) |
| Secondary outcomes | ||||||
| No. of drinking days per week last 28-day | 0.35 (0.08) | 0.02 (0.05) | −0.17 (0.04)*** | −0.04 (0.04) | −0.10 (0.06)† | −0.17 (0.06)** |
| Drinks per drinking day last 28-day | 1.18 (0.13) | 0.06 (0.08) | −0.48 (0.08)*** | −0.62 (0.08)*** | −0.29 (0.11)* | −0.26 (0.11)* |
| Maximum drinks last 28-day | 1.34 (0.15) | 0.08 (0.09) | −0.56 (0.09)*** | −0.62 (0.09)*** | −0.35 (0.13)** | −0.35 (0.13)** |
| SIPs + 6 count last 3 months | 0.93 (0.14) | −0.04 (0.08) | −0.50 (0.07)*** | −0.62 (0.07)*** | −0.15 (0.10) | −0.10 (0.10) |
aAll drinking outcome variable were log-transformed, except for any RAPS4 positive.
bSignificant tests not shown for intercepts.
†P < 0.10, *P < 0.05, **P < 0.01, ***P < 0.001.