COMPARISON OF THE VINELAND SOCIAL MATURITY SCALE, THE VINELAND ADAPTIVE-BEHAVIOR SCALES - SURVEY FORM, AND THE BAYLEY SCALES OF INFANT DEVELOPMENT WITH INFANTS EVALUATED FOR DEVELOPMENTAL DELAY

The Vineland Adaptive Behavior Scales is an extensive revision of the Vineland Social Maturity Scale; however, research comparing the two sc ales with different populations and measures of intelligence is limite d. The Vineland Adaptive Behavior Scales-Survey Form, the Vineland Soc ial Maturity Scale, and the mental scale of the Bayley Scales of Infan t Development were administered to 44 infants referred for evaluation of developmental delay. The differences between means were compared an d shared variance examined. The Vineland Adaptive Behavior Scales-Surv ey Form scores were significantly higher than those of the Vineland So cial Maturity Scale and the Bayley Mental Development Index. No signif icant differences were found between the means of the Vineland Social Maturity Scale and the Bayley Scales of Infant Development-Mental Deve lopment Index. Correlations were .59 between the Bayley Index and scor es on the Vineland-Survey Form and .72 between the Bayley Index and th e Vineland Social Maturity Scale. Between versions of the Vineland sca le r = .39. Implications for diagnosis and educational classification are discussed.