TABLE 4:
Temporal lobe gray and white matter ratios
| Group | Gray Matter |
White Matter |
||
|---|---|---|---|---|
| TICV Ratio* | TBV Ratio† | TICV Ratio* | TBV Ratio† | |
| Autism (n = 26) | 13.98 (7.96) | 15.22 (8.61) | 7.66 (4.40) | 8.35 (4.81) |
| Autism with macrocephaly (n = 12) | 15.70 (7.54) | 16.84 (8.07) | 9.19 (4.51) | 9.86 (4.88) |
| Control (n = 19) | 17.36 (4.43) | 18.67 (4.67) | 9.92 (2.65) | 10.68 (2.86) |
| Benign macrocephaly (n = 8) | 13.46 (8.56) | 14.77 (9.38) | 8.42 (5.78) | 9.23 (6.30) |
| Reading disorder (n = 17) | 15.13 (7.29) | 16.24 (7.83) | 9.05 (4.42) | 9.70 (4.73) |
| F statistic | 0.76 | 0.67 | 0.86 | 0.75 |
| P value | .56 | .62 | .49 | .56 |
Note.—Data are the mean. Numbers in parentheses are SD.
*
TICV Ratio = (Temporal Gray or White Matter/Total Intracranial Volume) × 100
†
TBV Ratio = (Temporal Gray or White Matter/Total Brain Volume) × 100