Table 1.

Descriptive data

Measure N = 25 for all measures	Mean (standard deviation)
Age: mean (S.D.)	75.0 months (53.4) range 13–220 months
Cognitive age-equivalent (BSID or KABC)	23.0 months (12.9) range 7–58 months
Developmental quotient (mean age-equivalent of BSID or KABC/chronological age)	44.6 (28.4) range 3–91
Vineland age-equivalent (mean of subscales except motor domain)	23.8 months (12.8) range 6–61 months
Vineland developmental quotient (mean of age-equivalents except motor domain/chronological age)	44.4 (25.3) range 3–95
Standard score using normative data on the Vineland	63.0 (16.8) range 25–95