Table 1.
Comparison between veterans with TBI and control veterans on demographic information and neurobehavioral scores
| Variable | TBI Veterans | Control veterans | Statistics (2‐tailed) |
|---|---|---|---|
| Age | (N = 176) 58.44 ± 3.16 | (N = 52) 59.04 ± 3.47 | t(226) = 1.18; p = .24 |
| Years of education | (N = 174) 14.85 ± 2.55 | (N = 51) 15.15 ± 2.50 | t(223) = 0.74; p = .46 |
| Preinjury AFQT percentile score | (N = 165) 61.50 ± 25.54 | (N = 32) 67.25 ± 22.93 | t(195) = 1.18; p = .24 |
| Postinjury (Phase III) AFQT percentile score | (N = 171) 53.55 ± 24.50 | (N = 51) 69.63 ± 21.53 | t(220) = 4.22; p < .001 |
| WMS working memory primary index percentile score | (N = 169) 49.98 ± 28.22 | (N = 51) 65.06 ± 26.33 | t(218) = 3.40; p = .001 |
| MMSE total score | (N = 165) 28.48 ± 2.02 | (N = 49) 29.12 ± 1.32 | t(120.97) = 2.63; p = .01 |
| BDI total score | (N = 175) 9.16 ± 9.09 | (N = 51) 11.04 ± 9.68 | t(224) = 1.28; p = .20 |
| SCID‐I/NP major depressive disorder lifetime prevalence | (N = 174) 1.40 ± 0.80 | (N = 51) 1.57 ± 0.88 | t(223) = 1.32; p = .19 |
| Krupp's fatigue severity scale score | (N = 175) 36.33 ± 11.92 | (N = 52) 37.31 ± 12.17 | t(225) = 0.52; p = .60 |
| NRS fatigability score | (N = 161) 1.69 ± 1.24 | (N = 48) 1.40 ± 1.11 | t(207) = 1.47; p = .14 |
| NPI apathy frequency x severity score | (N = 176) 0.77 ± 2.11 | (N = 52) 1.10 ± 1.94 | z = 2.35; p = .02 |
Means and standard deviations. AFQT, Armed Forces Qualification Test; WMS, Wechsler Memory Scale; MMSE, Mini‐mental State Exam; BDI, Beck Depression Inventory; SCID‐I/NP, Structured Clinical Interview for DSM‐IV‐TR Axis I disorders, Non‐Patient edition; NRS, Neurobehavioral Rating Scale; NPI, Neuropsychiatric Inventory.