Final answer:
The Strengths and Difficulties Questionnaire (SDQ) is for children ages 2-17 years, but the self-report version is specifically for children 11 years and older.
Step-by-step explanation:
The Strengths and Difficulties Questionnaire (SDQ) is a behavioral screening tool designed to assess children's mental health and well-being. The age range for the SDQ is targeted towards children ages 2-17 years. However, the specific self-report version, where children complete the questionnaire themselves, is intended for those 11 years and older. This self-report aspect of the questionnaire is significant as it corresponds with children's cognitive development, which allows them to reflect on their own emotions and behaviors adequately. For children under 11, parents or teachers typically complete the SDQ on behalf of the child to provide insights into the child's behaviors and feelings.