Fig. 3. Partial correlations between the PEP-R, K-WPPSI-IV, and VABS-II with age, sex, and socioeconomic status as a control (p<0.001). ABC, Adaptive Behavior Composite; DQ, developmental quotient; FRI, Fluid Reasoning Index; FSIQ, Full-Scale Intelligence Quotient; K-CARS 2, Korean Childhood Autism Rating Scale second edition; K-WPPSI-IV, Korean Wechsler Preschool & Primary Scale of Intelligence fourth edition; PEP-R, Psychoeducational Profile-Revised; PSI, Processing Speed Index; VABS-II, Vineland Adaptive Behavior Scales second edition; VCI, Verbal Comprehension Index; WMI, Working Memory Index.