Table 1.
Sample descriptive statistics and pairwise comparisons by PTSD diagnosis (N = 142).
| Characteristics | PTSD | No PTSD | Total | |
|---|---|---|---|---|
| N (%) | 46 (32.39) | 96 (67.61) | 142 (100) | |
| Sex | ||||
| Male | 35 (24.65) | 88 (61.97) | 123 (86.62) | |
| Female | 11 (7.75) | 8 (5.63) | 19 (13.38) | |
| Race | ||||
| Asian/PI* | 3 (2.11) | 7 (4.93) | 10 (7.04) | |
| Black | 10 (7.04) | 15 (10.56) | 25 (17.61) | |
| Latino | 4 (2.82) | 6 (4.23) | 10 (7.04) | |
| White | 28 (19.72) | 65 (45.77) | 93 (65.49) | |
| Other | 1 (0.70) | 3 (2.11) | 4 (2.81) | |
| Exposure to trauma | ||||
| Adult trauma | 46 (32.39) | 52 (36.62) | 98 (69.01)*** | |
| Child abuse | 13 (9.15) | 22 (15.49) | 35 (24.65)** | |
| Gulf War Illness Criteria | 11 (7.59) | 5 (4.02) | 16 (11.61)*** | |
| Mean (SD) | ||||
| Age | 44.46 (9.77) | 43.17 (9.98) | 44.83 (9.53)* | |
| Education§ | 14.51 (1.95) | 15.05 (1.96) | 14.63 (2.42)* | |
| Caudal ACC volume+ | 8.27 (0.21) | 8.28 (0.17) | 8.28 (0.18) | |
| Rostral ACC volume+ | 8.66 (0.15) | 8.66 (0.18) | 8.66 (0.16) | |
| EMG | 4.64 (4.82) | 4.50 (4.18) | 4.54 (4.99) | |
| SCR | 0.13 (0.11) | 0.10 (0.08) | 0.11 (0.09)* | |
| Heart rate | 0.65 (0.51) | 0.51 (0.50) | 0.54 (0.52) | |
Note: SD=standard deviation; PI=Pacific Islander.
§
Education is given in years.
+
ACC volume was log transformed; EMG, SCR, and heart rate are averaged across trials and threat conditions; N (%) and mean (SD) pairwise statistics were given by the χ2 and t statistic respectfully.
*
p < 0.05.
**
p < 0.005.
***
p < 0.001