Outcome or subgroup | Studies | Participants | Statistical method | Effect estimate |
---|---|---|---|---|
3.1 Continuous outcomes | Mean Difference (IV, Fixed, 95% CI) | Subtotals only | ||
3.1.1 Alcohol use as number of standard drinks consumed per day over the last 30 days | 1 | 147 | Mean Difference (IV, Fixed, 95% CI) | −0.40 [-2.03, 1.23] |
3.1.2 Illicit drug use as frequency of drug use (as measured by Addiction Severity Index - ASI drug) | 1 | 147 | Mean Difference (IV, Fixed, 95% CI) | 0.00 [-0.03, 0.03] |
3.1.3 Illicit drug use as a composite drug score (frequency*severity for all drugs taken) | 1 | 151 | Mean Difference (IV, Fixed, 95% CI) | 0.0[-0.42, 0.42] |
3.2 Dichotomous outcomes | Risk Ratio (M-H, Fixed, 95% CI) | Subtotals only | ||
3.2.1 Alcohol use as greater than 50% reduction in number of standard drinks consumed per day over the last 30 days | 1 | 166 | Risk Ratio (M-H, Fixed, 95% CI) | 1.10 [0.82, 1.48] |
3.2.2 Alcohol abstinence as abstinence from alcohol over the last 30 days | 1 | 166 | Risk Ratio (M-H, Fixed, 95% CI) | 0.88 [0.49, 1.58] |