Page 52 - Age of onset of disruptive behavior of residentially treated adolescents -Sjoukje de Boer
P. 52

Sex
When subsequently males and females of the EO group were compared, two differences in childhood characteristics were found: compared with EO males significantly more EO females had a parent who had been convicted of a crime (41% versus 12%, p=.014) and significantly (p<.0001) more females (63%) had been sexually abused compared with males (11%). This was also found for the AO group (65% females, 16% males, p=.001).
Logistic regression
The significant characteristics of Table 2 were entered into a logistic regression equation. The logistic regression analysis was performed to test the predictive value of the variables on (the dichotomous dependent variable) EO disruptive behavior. No significant differences between males and females were found after testing for interaction effects.
Table 3
Logistic regression analysis of the associations between childhood characteristics and EO and AO disruptive behavior
              n OR
203 2.44 146 2.88 72 .82 177 9.80 203 2.41 201 1.14 178 2.35 174 2.30 27 .68
Model 1
95%CI R2
Model 2
OR 95%CI
1.43       (0.39-5.32)
      Sex
Grade retention in primary school
Age at grade retention1
Impulsive behavior
Parents divorced
Number of changes in home environment Physical abuse
Working mother
Age placement outside of home < age 121
(1.26-4.75)* (1.10-7.56)*
.05
Model 1: univariate; model 2: multivariate. Multivariate model: n=98; EO = early-onset; OR = odds ratio; 95% CI = 95% confidence interval; R2 = Nagelkerke R2
* p < .05
** p < .003, significant after Bonferroni correction. Nagelkerke R2 model 2: 0.36
1 Due to small n not included in the multivariate model
AO = adolescent-onset;
The first model shows the bivariate odds ratios. Each of the characteristics significantly predicted membership of the EO group, except for age at placement
50
.05 (.69-.97)* .12
4.18
6.01 1.49 1.01 3.64 2.29
(1.12-15.68)*
(1.91-18.91)** (0.52-4.30) (0.80-1.29) (1.09-12.18)* (0.76-6.88)
(4.11-23.36)** (1.31-4.43)* (1.00-1.29)* (1.20-4.58)* (1.20-4.39)*
.26 .06 .03 .05 .05
(.45-1.01) .25
 




























































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