In NSCAW, three developmental domains were assessed:
- Communication: Receptive and verbal communication development was assessed using the Pre-School Language Scales 3rd Edition (PLS-3). Because of questionable reliability of scores for infants, it was used for children 12 months of age and older.
- Adaptive Behavior: Adaptive behavior skills were assessed using the Vineland Adaptive Behavior Screener (VABS) for daily living skills. Because of questionable reliability of scores for infants, it was used for children older than 10 months of age.
- Cognitive: Cognitive development was assessed using the Battelle Developmental Inventory (BDI). For children ages four and older, the Kaufman Brief Intelligence Test (K-BIT) was used.
Also assessed in some children:
- Neurodevelopment: Bayley Infant Neurodevelopmental Screener (BINS) was used with children 3 to 24 months of age to classify their risk for developmental problems into high, moderate, and low risk. This information was gathered from the caregiver.
- Behavior: Behavior problems in children at least two years of age were assessed using the parent completed Child Behavior Checklist (CBCL). The CBCL data are not included in most analyses. This information was gathered from the caregiver.