Table 5.

Associations between sibling bullying status groups at 12 years and depression, anxiety suicidal ideation and self-harm at 24 years.

	Sibling bullying status
Outcome OR (95% CI)	Uninvolved	Victim	p value	Bully-victim	p value	Bully	p value
Depression
N = 2,373
Unadjusted	Reference	1.19 (0.78–1.81)	0.423	1.91 (1.33–2.72)	0.000	1.06 (0.52–2.15)	0.870
Imputed adjusted	Reference	1.19 (0.78–1.83)	0.421	1.78 (1.23–2.58)	0.002	1.14 (.55–2.36	0.719
Anxiety
N = 2,359
Unadjusted	Reference	0.97 (0.62–1.50)	0.874	1.46 (1.00–2.13)	0.052	0.78 (0.35–1.50)	0.526
Imputed adjusted	Reference	0.92 (0.59–1.45)	0.732	1.33 (.90–1.96)	0.152	0.86 (9.38–1.92)	0.712
Suicidal ideation
N = 2, 372
Unadjusted	Reference	1.52 (1.16–1.98)	0.002	1.54 (1.19–1.99)	0.001	1.24 (0.80–1.92)	0.331
Imputed adjusted	Reference	1.47 (1.12–1.92)	0.005	1.40 (1.07–1.82)	0.013	1.20 (0.76–1.88)	0.432
Non-suicidal self-harm
N = 2,372
Unadjusted	Reference	1.09 (0.78–1.53)	0.621	1.08 (0.78–1.51)	0.642	0.92 (0.51–1.64)	0.770
Imputed adjusted	Reference	1.05 (0.74–1.59)	0.774	0.99 (0.70–1.40)	0.960	1.13 (0.62–2.06)	0.690
Suicidal self-harm
N = 2, 372
Unadjusted	Reference	2.20 (1.36–3.58)	0.001	1.27 (0.71–2.25)	0.418	0.50 (0.12–2.07)	0.337
Imputed adjusted	Reference	2.19 (1.34–3.59)	0.002	1.22 (0.68–2.19)	0.498	0.57 (0.14–2.39)	0.441

OR, Odds ratio; CI, Confidence intervals.

Bold = p < 0.010 (Bonferroni correction).

Confounders included in imputed adjusted analysis: sex, birth order, 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.