Table 1.
Pre-deployment Socio-demographic and Clinical Variables (N = 343)a.
| Variable | Mean (SD) or N (%)b |
|---|---|
| Age (SD) | 28.67 (8.41) |
| Male (%) | 315 (91.84) |
| Caucasian (%) | 241 (70.26) |
| Married or Cohabitating (%) | 160 (46.65) |
| Education beyond High School (%) | 268 (78.13) |
| Tobacco Use (%) | 160 (46.65) |
| Childhood Abuse (%) | 52 (15.16) |
| Rank E6 or below (%) | 293 (85.42) |
| Years in Military (SD) | 7.87 (7.94) |
| Previous Overseas Deployment (%) | 155 (45.19) |
| Number of Previous Deployments (SD) | 0.78 (1.18) |
| Previous Combat Zone Deployment (%) | 148 (43.15) |
| Number of Most Recent Combat Experiences (SD) | 2.30 (1.85) |
| Infantry battalion (%) | 248 (72.30) |
| Conner Davidson Resilience Scale (SD) | 83.90 (10.34) |
| Pre-deployment TBI (%) | 14 (4.08) |
| Pre-deployment PCL(SD) | 23.27 (8.47) |
| Pre-deployment PCL ≥ 34 (%) | 37 (10.79) |
| Pre-deployment PCL ≥50 (%) | 5 (1.46) |
| Pre-deployment Respiration Ratec | 15.01 (3.89) |
| Pre-deployment ln(HF) (SD) | 4.64 (1.23) |
| Pre-deployment SDNN (SD) | 47.25 (21.29) |
a
Abbreviations: TBl = traumatic brain injury, PHQ–9 = 9-item Patient Health Questionnaire for depression, PCL-M = military version of Post-traumatic Stress Disorder Checklist, SDNN = standard deviation of normal beat to beat or R–R interval, ln(HF) = natural log of high frequency heart rate variability band.
b
Results displayed as mean with (SD) and N with (%). 343 subject completed either the 3-month or 12-month follow-up.
c
Respiratory rate in breaths per minute.