Psychometric properties of the preschool strengths and difficulties questionnaire (SDQ) in UK 1-to-2-year-olds.

Unlabelled: Early identification of emotional and behavioural difficulties in very young children is crucial for intervention and prevention. The Strengths and Difficulties Questionnaire (SDQ) is a widely used measure of child and adolescent mental health that is brief, cost-effective, and easy to administer. The aims of this study were to establish the validity and reliability of the preschool SDQ in UK 1-2-year-olds.