Table 2.

Descriptive statistics in the three waves for primary and secondary outcomes.

Outcomes	Group	Pre-Intervention			Post-Intervention			Follow-Up
		M	SD	n	M	SD	n	M	SD	n
Moderate physical aggression	Control group	0.061	0.227	833	0.066	0.317	623	0.024	0.111	220
	Experimental group	0.053	0.224	535	0.036	0.189	421	0.021	0.094	154
Moderate physical victimization	Control group	0.071	0.280	835	0.075	0.322	629	0.039	0.161	220
	Experimental group	0.073	0.300	539	0.050	0.275	420	0.027	0.116	155
Severe physical aggression	Control group	0.040	0.184	831	0.037	0.222	623	0.023	0.094	220
	Experimental group	0.050	0.222	535	0.027	0.168	421	0.005	0.039	154
Severe physical victimization	Control group	0.041	0.194	835	0.044	0.229	629	0.027	0.119	230
	Experimental group	0.054	0.230	538	0.039	0.256	420	0.015	0.100	155
Sexual aggression	Control group	0.039	0.181	829	0.039	0.201	623	0.033	0.167	220
	Experimental group	0.042	0.259	532	0.035	0.181	420	0.015	0.082	154
Sexual victimization	Control group	0.071	0.299	833	0.060	0.259	629	0.058	0.239	220
	Experimental group	0.067	0.260	537	0.082	0.339	419	0.047	0.191	155
Bullying aggression	Control group	0.417	0.566	854	0.392	0.535	666	0.366	0.470	243
	Experimental group	0.423	0.555	542	0.408	0.588	450	0.319	0.425	173
Bullying victimization	Control group	0.659	0.729	857	0.649	0.737	667	0.626	0.674	243
	Experimental group	0.724	0.779	545	0.668	0.736	449	0.600	0.726	173