Table 1.
Demographics and Injury Severity by Group: Controls Versus Two TBI Groups
| Control Mean (SD) | Normal IHTT TBI Mean (SD) | Slow IHTT TBI Mean (SD) | Significance value | |
|---|---|---|---|---|
| N | 39 | 26 | 18 | |
| Age at testing (years) | 15 (3) | 14.6 (3.3) | 14.3 (2.4) | F = 0.41 (p = 0.66) |
| Gender (male) | 25 (64%) | 21 (81%) | 12 (67%) | χ2 = 2.17 (p = 0.34) |
| Handedness (right dominant) | 35 (90%) | 24 (92%) | 16 (89%) | χ2 = 0.18 (p = 0.92) |
| Time since injury (weeks) | – | 13.3 (5) | 13 (5.1) | F = 0.04 (p = 0.84) |
| Worst GCS score | – | 8.7 (4.6) | 7.4 (4) | F = 0.97 (p = 0.33) |
| Parent education (years) | 15.6 (3) | 13.7 (3.6) | 13 (3.8) | F = 4.47 (p = 0.02),  = 0.10 |
Worst GCS score = worst Glasgow Coma Scale score recorded in 24 h after injury. IHTT = interhemispheric transfer time averaged across left and right visual fields, in milliseconds. Parent education = highest number of years of education of either parent.
TBI, traumatic brain injury; SD, standard deviation.