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Table 1 Number of participants, age and scores for each measure and time point

From: Non-verbal IQ and change in restricted and repetitive behavior throughout childhood in autism: a longitudinal study using the Autism Diagnostic Interview-Revised

Measure Age of Dx (T1) Age 6 (T2) Age 8 Age 11 (T3)
N 205 199 205 157
Age 3.43 (.75) 6.61 (.33) 8.73 (.21) 10.73 (.21)
ADI-R RRB 4.52 (2.30) 4.07 (2.57) 3.66 (2.35)
WISC-IV PRI 91.28 (19.50)
  1. Note. Numbers in parenthesis are standard deviations. Dx = Diagnosis. ADI-R = Autism Diagnostic Interview -Revised. Numbers reported are mean total scores for the RRB domain using current scores. WISC-IV PRI = Wechsler Intelligence Scales for Children- Fourth Edition, Perceptual Reasoning Index. Number reported is the mean Standard Score