Cross-sectional study into the costs and impact on family functioning of 4-year-old children with aggressive behavior.

A post hoc Bonferroni test showed that the clinical group had significantly higher costs than the low and moderate group and the difference in costs between the clinical and borderline group was marginally significant, with the clinical group being more costly (post hoc Bonferroni: clinical versus low and moderate group: p = .00).

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