TABLE 3

Prevalence and ORs for Depression, Self-Harm, and Anxiety at Age 18 According to Self-Reports of Sibling Bullying at Age 12

OutcomeFrequency of Sibling BullyingLinear Trend
Never (N = 3643)Only Ever Once or Twice (N = 1191)2 or 3 Times a Month (N = 645)About Once a Week (N = 663)Several Times a Week (N = 786)
Depression
 % yes6.46.89.16.812.3
 Unadjusted OR (95% CI)1.000.91 (0.53–1.56)1.47 (0.83–2.60)1.25 (0.70–2.24)2.16 (1.33–3.51)*1.18 (1.06–1.33)*
 Adjusted OR (95% CI)1.000.79 (0.45–1.36)1.40 (0.78–2.55)1.00 (0.55–1.81)1.85 (1.11–3.09)*1.13 (1.01–1.27)*
 Imputed adjusted OR (95% CI)1.000.99 (0.68–1.45)1.31 (0.86–2.02)1.10 (0.72–1.69)1.64 (1.12–2.42)*1.18 (1.09–1.28)*
Self-harm
 % yes7.69.48.810.714.1
 Unadjusted OR (95% CI)1.001.57 (1.02–2.44)*1.46 (0.84–2.55)1.86 (1.13–3.05)*2.56 (1.63–4.02)*1.24 (1.12–1.38)*
 Adjusted OR (95% CI)1.001.31 (0.84–2.06)1.40 (0.79–2.47)1.68 (1.02–2.77)*2.26 (1.40–3.66)*1.21 (1.09–1.35)*
 Imputed adjusted OR (95% CI)1.001.23 (0.96–1.59)1.39 (1.01–1.90)*1.53 (1.15–2.04)*2.18 (1.41–3.10)*1.20 (1.08–1.30)*
Anxiety
 % yes9.39.96.910.416.0
 Unadjusted OR (95% CI)1.001.22 (0.81–1.83)0.57 (0.29–1.11)0.95 (0.56–1.61)1.83 (1.19–2.81)*1.09 (0.98–1.20)
 Adjusted OR (95% CI)1.001.08 (0.71–1.63)0.54 (0.27–1.06)0.84 (0.49–1.44)1.55 (0.95–2.38)1.04 (0.93–1.15)
 Imputed adjusted OR (95% CI)1.000.98 (0.71–1.34)0.82 (0.53–1.26)1.10 (0.76–1.58)1.43 (1.03–1.99)*1.07 (0.99–1.15)
  • Unadjusted and adjusted analyses used complete cases (N = 3452).

  • Adjusted model includes the following covariates: individual characteristics: gender, mother-reported emotional and conduct problems at age 7, peer victimization at age 8, self-reported depression at age 10; family characteristics: first-born versus not, number of children in family, mother’s marital status, parental social class, maternal education, mother’s history of depression, domestic violence and maltreatment.

  • * P <.05.