Jaycox 2006.
| Methods | Cluster‐RCT. Within schools, 'tracks' and classes were randomly allocated to receive the intervention or control | |
| Participants | 2464 9th grade students (mean age 14.41 years; 48% male, 52% female) from 10 high schools consisting of predominantly (> 80%) Latino students, USA | |
| Interventions | Intervention: 'Break the Cycle: Ending Violence' programme consisting of lecture, role play, videos and exercises covering domestic violence and the law. Delivered by bilingual, bicultural attorneys. The intervention was delivered in 3 sessions (duration unclear) over 3 consecutive days with a follow‐up session 6 months later. The intervention was implemented on 3 separate cohorts over 3 school years. 1232 students Control: standard health curriculum. 1232 students |
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| Outcomes | Episodes of victimisation and dating violence, knowledge and norms regarding dating violence, and propensity to seek help as measured by several scales developed by the authors to assess knowledge and help‐seeking behaviours. Also used Revised Conflict Tactics Scale | |
| Follow‐up | Immediate and 6 months post‐test | |
| Notes | ‐ | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | Classes "randomly allocated" |
| Allocation concealment (selection bias) | Unclear risk | Not stated |
| Incomplete outcome data (attrition bias) All outcomes | Low risk | Initially 3800 students assigned to intervention or control. Exclusions due to non‐consent from students or their parents (or both) and non‐completion of post‐test surveys. Similar rates in each arm. Overall attrition: 33% (1260/3800). Reasonable for 6‐month follow‐up |
| Selective reporting (reporting bias) | Low risk | All outcomes reported in full (number of participants, means and SDs) |
| Blinding of participants and personnel (performance bias) All outcomes | Low risk | Blinding not possible but 10% of classes were observed by an expert to assess fidelity to the intervention protocol, thereby minimising variability in delivery of intervention as much as possible |
| Blinding of outcome assessment (detection bias) All outcomes | Unclear risk | Not stated |