Table 1 Data extracted on characteristics, primary and secondary outcomes
Study characteristics | Primary outcome data | Secondary outcome data |
|---|---|---|
Authors, design, location, setting, duration, substance use behaviours addressed, intervention content and activities, theoretical underpinning, types of participants, duration of follow-up, statistical details (including whether clustering was accounted for) | All data relating to use of alcohol (primary outcomes: alcohol use or frequency, and binge drinking), tobacco (primary outcomes: tobacco use or frequency, and heavy smoking) and other drug use (primary outcomes: cannabis use or frequency, and other illicit drug use1). Outcome data were extracted as reported by the study authors for all follow-up timepoints. This included raw dichotomous and continuous data at baseline and follow-up (e.g. number of events and participants, or mean and standard deviations), effect sizes and model estimates (with uncertainty) | Secondary outcomes included: education and employment (e.g. educational qualifications, employment, not being in education, employment or training (NEET), receipt of government benefits); crime; long term addictive behaviours; health outcomes (e.g. teenage pregnancy or parenthood, mental health outcomes, morbidity, premature mortality); dependence or harmful substance use; adverse events as a result of the intervention; and cost effectiveness of the intervention |