Social-emotional development
behavioral disorders
Child socio-emotional development was measured based on caregiver report using the BSID-III tool at 1y and 2y, and the Strengths and Difficulties Questionnaire (SDQ) at 6-7y. Both BSID-III and SDQ tools have been validated and widely used to assesses emotional and behavioral disorders among children in several countries including Vietnam [All the outcome measures were finally transformed to standardized Z-scores to facilitate comparisons of child’s performance over time within and between individuals.