TABLE 1

Characteristics of the Study Population

	Children With Teacher Report Data of Bullying (N = 4364)		Children With Self and Peer Report Data of Bullying (N = 1327)^a
	N^b	%	N	%
Child characteristics
Gender (% boys)	2206	50.6	645	48.6
National origin
Dutch	2313	54.5	776	60.0
Other western	379	8.9	143	11.0
Nonwestern	1549	36.5	375	29.0
Wt status
Normal wt	3526	80.8	1106	83.4
Overweight	595	13.6	161	12.1
Obese	243	5.6	60	4.5
Mean age at BMI assessment in years (SD)	4364	6.2 (0.5)	1327	6.1 (0.5)
Bullying involvement
Uninvolved	2846	65.2	872	65.7
Victim	193	4.4	193	14.5
Bully	715	16.4	162	12.2
Bully–victim	610	14.0	100	7.5
Mean age at bullying assessment in years (SD)	3757	6.8 (1.3)	1327	7.7 (0.8)
Maternal and family characteristics
Educational level
Primary or secondary	1734	47.4	411	36.2
Higher vocational	958	26.2	353	31.0
Academic	967	26.4	372	32.8
Single parenthood (% yes)	550	15.0	170	14.8
Presence of siblings (% no)	677	20.0	218	19.4

↵^a Child reports represent self-reported victimization and peer-reported bullying.
↵^b Some data were missing for national origin (n = 123), age at bullying assessment (n = 607), maternal educational level (n = 705), single parenthood (n = 689), and presence of siblings (n = 797).