Comparison 4. Combined anger response & social skills interventions versus no intervention by type of school.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Difference in aggression scale score or observed aggression by type of school (post test)	7	594	SMD (Random, 95% CI)	‐0.28 [‐0.55, ‐0.01]
1.1 Primary school	6	576	SMD (Random, 95% CI)	‐0.28 [‐0.58, 0.01]
1.2 Secondary school	1	18	SMD (Random, 95% CI)	‐0.37 [‐1.37, 0.63]
2 Difference in aggression scale score or observed violence by type of school (up to 12/12)	3	463	SMD (Random, 95% CI)	‐0.34 [‐0.93, 0.26]
2.1 Primary school	3	463	SMD (Random, 95% CI)	‐0.34 [‐0.93, 0.26]
2.2 Secondary school	0	0	SMD (Random, 95% CI)	0.0 [0.0, 0.0]
3 Difference in school response to aggressive acts + other acts by school (post test)	1	480	SMD (Random, 95% CI)	‐1.95 [‐2.19, ‐1.71]
3.1 Primary school	0	0	SMD (Random, 95% CI)	0.0 [0.0, 0.0]
3.2 Secondary school	1	480	SMD (Random, 95% CI)	‐1.95 [‐2.19, ‐1.71]
4 Difference in school response to aggressive acts + other acts by school (up to 12 months)	0	0	SMD (Random, 95% CI)	0.0 [0.0, 0.0]
4.1 Primary school	0	0	SMD (Random, 95% CI)	0.0 [0.0, 0.0]
4.2 Secondary school	0	0	SMD (Random, 95% CI)	0.0 [0.0, 0.0]