Table 1. Participant Characteristics.
| ASDHA | ASDLA | TD | |
|---|---|---|---|
|
|
|||
| TOTAL | 14 | 31 | 18 |
| Race | |||
| # Caucasian | 13 | 31 | 18 |
| # African American | 1 | - | - |
| Language | |||
| # Verbal | 10 | 28 | 18 |
| # Minimally Verbal | 3 | 1 | - |
| # No language data | 1 | 2 | - |
| ASDHA M (SD) | ASDLA M (SD) | TD M (SD) | |
|
|
|||
| ABC Irritability | 23.86 (5.17) | 7.10 (4.84) | 1.00 (1.57) |
| (min-max) | (18-33) | (0-17) | (0-5) |
| BASC Anxiety | 52.40 (13.30) | 51.50 (11.92) | -- |
| (min-max) | (36-71) | (34-80) | |
| ADOS | 14.57 (3.80) | 15.22 (3.95) | 1.50 (1.38) |
| (min-max) | (7-20) | (6-23) | (0-4) |
| Full Scale IQ | 97.43 (27.61) | 94.13(20.85) | 118.57 (18.11) |
| (min-max) | (48-136) | (58-137) | (93-144) |
| Scan age in years | 7.93 (3.34) | 8.77 (3.22) | 9.22 (2.32) |
| (min-max) | (3-13) | (3-13) | (5-13) |
| TICV, mm3 | 1,575,136 (159,480) | 1,610,711 (183,651) | 1,513,308 (249,142) |
| (min-max) | (1,383,898-2,010,302) | (1,179,262-1,942,259) | (1,000273-2,151,003) |
Note. All participants were male. Language category (verbal versus minimally verbal) was determined using quesiton 30 on the ADI-R. Aggression status was determined using Irritability subscale score from the Aberrant Behavior Checklist (ABC). Following McCracken et al. (2002) among others, scores <18 are Low Aggression (ASDLA) and scores ≥18 are High Aggression (ASDHA). BASC Anxiety = Anxiety subscale from the Behavioral Assessment Scales for Children. The Composite Intelligence Estimate was calculated from various IQ tests given to different participants following the procedures described below. TICV = Total Intracranial Brain Volume, in mm3.