Contreras 1981.

Methods	Randomisation by computer generated table of random numbers.
Participants	22 senior high school students previously suspended for aggressive behaviours (11/22 in Special Education, of whom 8 intellectually disabled).
Interventions	I1: Structured life skills program (2 x 60 minute sessions per week for 5 weeks). P: Discussion group of song lyrics. C: No intervention
Outcomes	(1) *Videotape recordings of physical aggression (Independent observers) (blinding unclear)(2) *school suspensions, from school records
Notes	Data collected during last session and at one week.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear