Table 1.
Mean (SD) of language and PIQ scores of children at ages 7, 8, 11 and 16
| Age 7 | Age 8 | Age 11 | Age 16 | |
|---|---|---|---|---|
| Receptive language standard scoresa | 83.6 (11.3) | 85.5 (12.4) | 86.6 (15.6) | 83.1 (16.5) |
| Expressive language standard scoresb | 83.2 (10.0) | 83.8 (11.3) | 73.7 (11.7) | 73.1 (10.6) |
| PIQ standard scoresc | 105.5 (15.0) | 108.2 (15.7) | 85.8 (23.6) | 83.7 (18.9) |
aReceptive language measures at ages 7, 8 and 11: test for reception of grammar [39]; age 16—word classes subset of the clinical evaluation of language fundamentals [41]
bExpressive language measures: ages 7 and 8—Bus Story Test [40]; age 11 and 16—Recalling Sentences subtest of the Clinical Evaluation of Language Fundamentals—Revised [41]
cPIQ measures: age 7 and 8—Raven’s coloured progressive matrices [37]; age 11—Block Design and Picture Completion of the Wechsler Intelligence Scale for Children—third edition [38] and at age 16 the full form of the Wechsler Intelligence Scale for Children—third edition [38]