Outcomes reported by included studies
| Programme | Follow-up | Analysis samples: intervention vs control | Outcomes as reported | Findings: postintervention, intervention vs control | Findings: 18 months postintervention, intervention vs control |
|---|---|---|---|---|---|
| BBBS28 29 | Single follow-up conducted 18 months after randomisation | 487 vs 472 | Number of times hit someone | Mean 1.83 vs 2.68, p<0.05 | |
| Number of times involved in a fight | Mean 1.52 vs 1.54, p>0.10 | ||||
| NGYCP36–38 | First follow-up at 21 months postrandomisation (after completion of postresidential phase); second follow-up at 39 months postrandomisation (18 months after programme completion) | 736 vs 460 (first follow-up) 722 vs 452 (second follow-up) | Any violent incidents in last 12 months | 54.0% vs 57.3%, p=0.263 | 48.7% vs 44.5%, p=0.157 |
| Charged with a violent crime in last 12 months | 3.4% vs 3.6%, p=0.842 | ||||
| Convicted of a violent crime in last 12 months | 1.4% vs 1.2%, p=0.748 | 2.1% vs 2.3%, p=0.208 | |||
| Number of violent incidents in last 12 months | Mean 2.0 vs 2.3, p=0.035 | Mean 0.9 vs 0.8, p=0.388 | |||
| QOP30 31 | End of programme's fourth year (near graduation from high school) | 589 vs 480 | Involved in gang fight in last 12 months | 16.0% vs 14.0%, p>0.10 |
BBBS, Big Brothers Big Sisters; NGYCP, National Guard Youth ChalleNGe Program; QOP, Quantum Opportunity Project.