Table 1.
Group Mean (SD) Demographic, Psychometric, and Cavum Septum Pellucidum Data
| PTSDa | Non-PTSDa | ||||
|---|---|---|---|---|---|
| (Ex n = 20) (Ux n = 23) |
(Ex n = 23) (Ux n = 24) |
Mixed Model Analysesb |
|||
| Mean (SD) | Mean (SD) | PTSD Diagnosisa | Combat Exposure | Interaction | |
| Age | |||||
| Exposed | 52.3 (3.3) | 51.8 (2.3) | t = .5 | t = 1.0 | t = 1.1 |
| Unexposed | 52.7 (3.2) | 51.8 (2.3) | p = .48 | p = .32 | p = .27 |
| Educationc | |||||
| Exposed | 13.5 (2.5) | 14.7 (2.4) | t = 2.1 | t = .3 | t = 1.0 |
| Unexposed | 13.8 (3.2) | 14.5 (2.5) | p = .16 | p = .58 | p = .34 |
| CAPS Score | |||||
| Exposed | 73.3 (16.4) | 6.4 (7.5) | t = 25.1 | ||
| Unexposedd | 72.3 (16.1) | 6.8 (7.6) | p < .0001 | ||
| Whole Brain Volume (mL) | |||||
| Exposed | 1241 (118) | 1258 (106) | t = 00 | t = .50 | t = 1.9 |
| Unexposed | 1257 (116) | 1247 (110) | p = .85 | p = .94 | p = .07 |
|
n (%) |
n (%) |
||||
| Abnormal CSPe | |||||
| Exposed | 5 (25%) | 4 (17%) | χ2 = 2.8 | χ2 = .5 | χ2 = .5 |
| Unexposed | 9 (39%) | 4 (17%) | p = .09 | p = .48 | p = .49 |
Ex, combat-exposed; Ux, combat-unexposed; PTSD, posttraumatic stress disorder; CAPS, Clinician-Administered PTSD Scale; CSP, cavum septum pellucidum.
a
Combat-related PTSD diagnostic status of the combat-exposed twin.
b
All p values are two-sided.
c
Grades completed.
d
Combat-exposed brother’s score.
e
Of approximate length ≥5.6 mm.