Table 2.

Prevalence (%) and relative change (%) in being bullied and in bullying others over time for the completer schools

	Victims					Perpetrators
	t0	t1	t2	t0–t1	t0–t2	t0	t1	t2	t0–t1	t0–t2
Gender
Boys	8.54	7.11	7.95	16.76	6.91	8.61	6.14	6.65	28.62**	22.67*
Girls	9.75	6.61	5.61	32.13**	42.44***	3.70	2.60	2.41	29.64	34.90*
Grade-level
5–7	10.00	7.79	6.43	22.05*	35.74***	5.29	3.91	3.53	26.14	33.41*
8–9	8.07	5.62	7.40	30.41**	8.36	7.23	5.10	6.15	29.42*	14.97
School-type
A	7.51	6.08	7.04	19.01	6.30	5.25	3.79	5.46	27.84	-4.00
B	9.92	7.26	6.74	26.87**	32.02***	6.60	4.73	4.27	28.29*	35.25**
Total	9.14	6.87	6.83	24.87**	25.26**	6.16	4.42	4.63	28.25**	24.86**

^*p < .05; **p < .01; ***p < .001