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TABLE 1: Age, PIQ, head circumference, and height data for autistic and control subjects
Characteristic Autistic Subjects Control Subjects F Values
Normocephalic Macrocephalic Normocephalic Macrocephalic Reading Disorder
No. of subjects^* 26 12 19 8 17 
Age (y) 
 Mean (SD) 14.15 (6.05) 12.75 (4.43) 12.53 (4.48) 12.50 (3.46) 12.65 (3.10) .48, P = .75
 Range 8–31 7–19 7–22 8–16 7–18 
No. of subjects older than 19 y 4 0 2 0 0 
PIQ 
 Mean (SD) 97.50 (19.29) 108.58 (18.22) 101.25 (15.55) 117.88 (11.69) 100.18 (10.88) 2.82, P = .03
 Range 62–141 69–125 74–126 103–136 82–129 
zHC 
 Mean (SD) 0.45 (0.98) 2.78 (0.77) 0.20 (1.18) 3.02 (1.01) −0.02 (1.36) 21.86, P < .001
 Range −1.81–1.46 1.93–4.12 −1.75–1.81 2.14–5.20 −2.30–2.04 
zHgt 
 Mean (SD) −0.23 (1.12) 0.72 (1.26) 0.56 (1.05) 0.83 (.67) 0.50 (.98) 2.97, P = .02
 Range −2.51–1.98 −1.38–3.17 −0.69–2.86 0.24–1.98 −1.20–2.86 
Grade level mean 6 7 5 9 6 
Note.—zHC indicates z score for head circumference; zHgt, z score for height. The z score is the number of SDs a value is away from the reference data mean for age and sex. In reference data mean, zHC + zHgt = 0.
* All subjects are male.