Fig. 1

The Vineland Adaptive Behavior Scale (VABS) is a standardized assessment of adaptive behavior skills across four domains: Communication, Motor, Daily Living Skills, and Socialization. The chronological age at the time of evaluation (years) is plotted against the estimated age-equivalent of the following subdomains: expressive language skills, personal daily living skills, interpersonal relationship skills, and fine motor skills. The motor domains of the VABS have a ceiling of approximately 8 years. The gray lines represent the cross-section of the chronological age and age-equivalent at 5 years for expressive language skills, personal daily living skills, and interpersonal relationship skills, and 4 years for fine motor skills