Table 1. Timing of oigarche/menarche reported at age 15, being involved in bullying at age 15 (T1) and two years later at age 17 (T2) and mean values (standard deviations) of the Depressive and Externalizing Symptom Scales among Finnish adolescents (%).

	Boys T1(age 15) n = 903	Boys T2(age 17) n = 903	Girls T1(age 15) n = 1167	Girls T2(age 17) n = 1167
Timing of oigarche/menarche
10 or less	4.8		2.7
11	12.7		17.0
12	28.3		35.6
13	29.2		27.7
14	13.5		13.3
15 or later	3.2		2.1
Has not occurred yet	4.0		1.3
Missing	4.2		0.3
Has been bullied
Never	79.1	86	85.2	92.5
Once or twice	14	9.5	10.8	4.7
2–3 times a month	1.9	0.8	1.9	0.4
Once a week	2.3	1.2	1.3	0.3
Many times a week	2.4	1.2	0.9	0.3
Is not at work or studying	–	0.6	–	1.4
Missing	0.3	0.7	0	0.3
Has bullied others
Never	68.8	83.3	86.1	93.2
Once or twice	24.4	12.1	12.1	4.5
2–3 times a month	2.3	1.2	0.3	0.3
Once a week	1.8	1.2	0.8	0.3
Many times a week	2.5	1.1	0.5	0.1
Is not at work or studying	–	0.6	–	1.4
Missing	0.2	0.6	0.2	0.2
Has been left alone
Never	86.2	87.0	84.2	83.7
Once or twice	10.3	7.5	11.1	10.3
2–3 times a month	0.8	1.1	2.1	1.8
Once a week	1.0	0.9	0.9	1.1
Many times a week	1.3	1.8	1.3	1.3
Is not working or studying	–	0.7	–	1.4
Missing	0.4	1.0	0.5	0.4
Depression (BDI)
Mean score (sd)	2.0 (3.5)	1.9 (3.6)	3.1(4.1)	3.0 (4.2)
Aggression (YSR)
Mean score (sd)	7.7 (5.8)	6.3 (5.4)	9.0 (5.0)	7.6 (4.7)
Delinquency (YSR)
Mean score (sd)	5.3 (2.7)	5.4 (2.8)	5.4 (2.7)	5.3 (2.3)