Table 4.

Associations between sibling bullying status groups at 12 years and depression, anxiety and self-harm at 18 years.

	Sibling bullying status
Outcome OR (95% CI)	Non-involved	Victim	p value	Bully-victim	p value	Bully	p value
N = 2,802
Depression
Unadjusted	Reference	1.62 (1.07–2.45)	0.022	2.23 (1.54–3.22)	0.000	0.77 (0.33–1.78)	0.539
Imputed adjusted	Reference	1.56 (1.03–2.37)	0.038	2.06 (1.41–3.01)	0.000	0.92 (0.39–2.16)	0.854
Anxiety
Unadjusted	Reference	1.04 (0.69–1.56)	0.853	1.72 (1.22–2.41)	0.002	0.60 (0.28–1.31)	0.198
Imputed adjusted	Reference	0.99 (0.66–1.49)	0.959	1.57 (1.11–2.23)	0.011	0.71 (0.32–1.56)	0.389
Self-Harm
Unadjusted	Reference	1.38 (0.94–2.03)	0.103	2.06 (1.47–2.89)	0.000	0.88 (0.44–1.76)	0.713
Imputed adjusted	Reference	1.29 (0. 87–1.91)	0.201	1.85 (1.31–2.61)	0.001	1.08 (0.53–2.20)	0.834

OR, Odds ratio; CI, Confidence intervals.

Bold = p < 0.017 (Bonferroni correction).

Confounders included in imputed adjusted analysis: sex, maternal depression, internalizing and externalizing problems, peer bullying victimization and perpetration, maltreatment, domestic violence.

Children presenting any psychiatric diagnosis at 7 years were excluded.

Non-Involved, Youth reporting no frequent* victimization or perpetration; Victims, Youth reporting frequent victimization only; Bully-Victims, Youth reporting both frequent victimization and perpetration. Bullies, Youth reporting frequent perpetration only.

*Frequent, At least once a week in the past 6 months.