Results of the Parenting Stress Index: the child domain.

*indicates statistically significant differences in Assessment 2 relative to Assessment 1 (p < 0.05; linear mixed model analysis). P means the value of the two sample t-tests between the subscale means of the intervention and the control group at Assessment 1. p value means the value of the linear mixed model analysis between the two groups in Assessment 1-Assessment 2 changes. Effect size means the value of Cohen's d statistic, which is defined as the the difference between two means divided by a standard deviation for the data. IG = the intervention group, CG = the control group, SD = standard deviation, CI = confidence interval, CSR = compound symmetry correlation, ICC = intraclass correlation.