Table 3.
Baseline values for participant demographic and substance use‒related variables by intervention condition (completers-only sample N=211).
|
|
Intervention | Control | Pa | |
| Completers-only sample, nb (%) | 108 (51.2) | 103 (48.8) |
|
|
| Age in years, mean (SD) | 16.87 (0.71) | 17.03 (0.76) | .130 | |
| Sex (women), % | 52.9 | 52.6 | .959 | |
| Country of residence, % |
|
|
.955 | |
|
|
Sweden | 26.9 | 28.2 |
|
|
|
Germany | 15.7 | 13.6 |
|
|
|
Belgium | 13.0 | 11.7 |
|
|
|
Czech Republic | 44.4 | 46.6 |
|
| School status (yes) | 88.0 | 88.3 | .961 | |
| Parental education levelc, % |
|
|
.198 | |
|
|
Low | 14.6 | 12.4 |
|
|
|
Middle | 43.8 | 57.3 |
|
|
|
High | 41.6 | 30.3 |
|
| Intention to reduce alcohold, mean (SD) | 2.76 (2.12) | 3.13 (2.08) | .223 | |
| Intention to abstain from illegal drugsd, mean (SD) | 5.39 (2.37) | 5.59 (2.22) | .539 | |
| Descriptive peer drinking norms, mean (SD) | 2.33 (0.66) | 2.35 (0.64) | .856 | |
| Substance use related risk (CRAFFT sumscore), mean (SD) | 2.56 (1.32) | 2.80 (1.35) | .210 | |
| Age at first alcohol use, mean (SD) | 12.97 (2.34) | 13.06 (2.27) | .781 | |
| Alcohol usee (last 12 months), mean (SD) | 4.89 (2.27) | 5.20 (2.47) | .348 | |
| Alcohol usef (last 30 days), mean (SD) | 5.35 (2.44) | 5.53 (2.87) | .644 | |
| Drinking frequencyg, mean (SD) | 2.09 (0.79) | 2.04 (0.89) | .695 | |
| Drinking quantityg, mean (SD) | 1.77 (1.27) | 1.85 (1.46) | .694 | |
| Binge drinking frequencyg, mean (SD) | 1.54 (0.86) | 1.69 (0.93) | .261 | |
| Illegal drug use (last 30 days), % | 42.6 | 39.5 | .946 | |
| Polydrug use (last 30 days), % | 37.0 | 31.1 | .313 | |
aResults of chi-square tests for categorical and ttests for continuous measures.
bMay differ for individual variables due to single missing values.
cFather’s highest educational attainment.
dScores ranging from 1-7 with higher scores indicating higher motivation for change.
eAUDIT-C index score, past 12 months.
fAUDIT-C based drinking index score, past 30 days (primary outcome).
gSeparate drinking indicators, scores ranging from 0-4 with higher scores indicating more severe drinking.