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.