Strengths and Difficulties Questionnaire (SDQ) as an assessment tool for measuring emotional and behavioural problems in young children

Abstract

Abstract Evaluation of new initiatives to tackle mental health problems in children requires instruments that are both valid and reliable. One such instrument is the Strengths and Difficulties Questionnaire (SDQ), an assessment tool for child emotional and behavioural problems. The instrument was developed by Goodman in the 1990's and is being used worldwide in both clinical settings and research projects. However, previous studies on the SDQ have mainly focused on school-aged children and adolescents. We know very little about the usefulness of the SDQ for measuring preschool children's mental health problems. Using data from a large number of parents and preschool teachers of children aged 3-5 (> 11 000 questionnaires), we tested the psychometric properties of the SDQ, examined the inter-rater agreement and provided cut-off points. The original five-factor model of the SDQ was supported and it was shown to be a reliable instrument in the hands of mothers, fathers and preschool teachers. We also found significant, albeit poor, agreement (ICC) between parent and teacher ratings and good agreement between parents' ratings. Teachers reported lower levels of problems compared to parents. Compared to girls, boys were generally reported to have more problems. Thus, we provided separate cut-offs for each age group, gender and rater category. The results suggest that SDQ can reliably be used for measuring emotional and behavioural problems in young children in community settings. They also suggest that parent and teacher reports are complementary; hence, reports from both types of informants should be considered when using the SDQ as a method to identify mental health problems within the child health services. However, inter-rater agreement between mothers and fathers was good, meaning that it may be sufficient to obtain data from a single parent informant.