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Table 1 Intellectual ability in Williams syndrome

From: The effect of intellectual ability on functional activation in a neurodevelopmental disorder: preliminary evidence from multiple fMRI studies in Williams syndrome

Author (year) n Age (years) Measure FSIQ VIQ PIQ
Mean (Range) Mean (Range) Mean (Range)
Boddaert et al. (2006) 9 5-15 WISC-III 63 (50–79) 76 (62–91) 53 (43–65)
Don et al. (1999) 18 8-13 WISC-III 52 nr 61 (46–81) 50 (45–62)
Howlin et al. (1998) 62 19-39 WAIS-R 60 nr 64 nr 60 nr
Pagon et al. (1987) 9 10-20 WISC-R 42 (40–75) 54 (45–85) 52 (45–69)
Reiss et al. (2004) 43 12-50 WISC-R, WAIS-R 68 (46–83) nr nr nr nr
Searcy et al. (2004) 80 17-52 WAIS-R 67 nr 71 nr 66 nr
  1. For each study, participant ages, IQ measure, full scale IQ (FSIQ), verbal IQ (VIQ), and performance IQ (PIQ) are listed. nr, not reported.