Dutch norms for the Strengths and Difficulties Questionnaire (SDQ) - parent form for children aged 2-18 years.

Dutch normative data by age-group and gender are now available for parent-reported SDQ scores in children aged 2-18 years. Due to insufficient internal consistency, normative scores for 2-5 year-old children could not be presented for several SDQ scales. Yet, the SDQ Total score provides a reliable indication of the psychosocial functioning of younger children. In case of high Total scores in children younger than 6 years, alternatively to scale scores, the answers on the individual items could yield useful clinical information about the child's problems.