This paper presents tables for converting raw scores on the Bayley Scales of Infant Development to Mental Development Index and Psychomotor Development Index values. The tables were developed to generate index values for young children with developmental delays, based on recent revision of the scales and standardization procedures. Methodology is…

Sixty subjects age 6 to 30 months were assessed with the Bayley Mental Scale of Infant Development (BMSID). Mean scores were substantially higher than standardized norms would predict, indicating that Bayley norms need to be revised, and that strict interpretation of the BMSID may result in misdiagnosis of some infants with developmental…