The factor structure of the behavior rating scale of the Bayley scales of infant development .2.

The authors investigated the construct validity of scores on the Behavior Rating Scale of the revised Bayley Scales of Infant Development (BSID-II). They employed national standardization samples of children ranging in age from roughly 1 to 42 months, and a variety of factor analytic methods. As might be expected, motor performance dominated the factor space, and structure became more complex at older ages as children became more heterogeneous.