Hester van Eeren

| Chapter 5 5 | 126 Table III. Standardized bias of missing indicators in full sample (N = 697) Missing indicators § Before PS application After PS application CBCL Internalizing problems Missing 0.07 0.07 Not missing 0.07 0.07 Externalizing problems Missing 0.07 0.07 Not missing 0.07 0.07 Total behavioral problems Missing 0.07 0.07 Not missing 0.07 0.07 YSR Internalizing problems Missing 0.14 0.11 Not missing 0.14 0.11 Externalizing problems Missing 0.14 0.11 Not missing 0.14 0.11 Total behavioral problems Missing 0.14 0.11 Not missing 0.14 0.11 Parenting stress Missing 0.01 0.06 Not missing 0.01 0.06 Gender Missing 0.07 0.07 Not missing 0.07 0.07 Country of birth Missing 0.05 0.04 Not missing 0.05 0.04 Living situation adolescent Missing 0.09 0.02 Not missing 0.09 0.02 Living situation adolescent Missing 0.16 0.04 Secondary outcome Not missing 0.16 0.04 Level of education Missing 0.02 0.07 Not missing 0.02 0.07 Previous treatment Missing 0.24 0.05 Not missing 0.24 0.05 Engagement in school or work Missing 0.12 0.09 Secondary outcome Not missing 0.12 0.09 Court order Missing 0.09 0.01 Not missing 0.09 0.01 Police contacts during treatment Missing 0.12 0.03 Secondary outcome Not missing 0.12 0.03 Relation father Missing 0.17 0.03 Not missing 0.17 0.03 Relation mother Missing 0.26 0.03 Not missing 0.26 0.03 Relation siblings Missing 0.18 0.09 Not missing 0.18 0.09 Relation peers Missing 0.16 0.05 Not missing 0.16 0.05 Country of birth primary caregiver  Missing 0.11 0.20 Not missing 0.11 0.20 Level of education primary caregiver  Missing 0.31 0.01 Not missing 0.31 0.01 Employment primary caregiver Missing 0.16 0.05 Not missing 0.16 0.05 Partner primary caregiver Missing 0.05 0.11 Not missing 0.05 0.11 § No missing values were present for the variable ‘Age’, thus the missing indicator was not needed.