Table 3.
Multivariate Cox Proportional Hazards Regression Analysis Examining Associations of Psychiatric Diagnosis Status and Drug-Related Discharges in Two Cohorts of Marine Corps Personnel, 2001-2007
| Non-war deployed n = 13 944 | War deployed n = 77 881 | |||
|---|---|---|---|---|
| HR | 95% CI | HR | 95% CI | |
| Psychiatric diagnosis status | ||||
| No psychiatric diagnosis | 1.00 | 1.00 | ||
| Psychiatric diagnosis without PTSD | 5.65** | 4.37 to 7.29 | 5.22** | 4.59 to 5.94 |
| PTSD diagnosis | 5.72** | 1.80 to 18.19 | 8.60** | 6.95 to 10.64 |
| AFQT score | ||||
| Low (0-50) | 1.00 | 1.00 | ||
| Medium (51-70) | 0.77 | 0.59 to 1.02 | 0.79** | 0.69 to 0.90 |
| High (71-99) | 0.37** | 0.26 to 0.52 | 0.46** | 0.39 to 0.54 |
| Sex | ||||
| Male | 1.00 | 1.00 | ||
| Female | 0.51** | 0.33 to 0.77 | 0.40** | 0.24 to 0.55 |
| Race/ethnicity | ||||
| Caucasian | 1.00 | 1.00 | ||
| African American | 0.85 | 0.59 to 1.23 | 1.73** | 1.46 to 2.05 |
| Hispanic | 0.41** | 0.26 to 0.65 | 0.63** | 0.52 to 0.77 |
| Other/mixed/missing | 0.71 | 0.42 to 1.18 | 0.75* | 0.57 to 0.98 |
| Accession age | ||||
| <19 years | 1.00 | 1.00 | ||
| ≥19 years | 1.01 | 0.79 to 1.30 | 0.91 | 0.81 to 1.02 |
AFQT, Armed Forces Qualification Test; CI, confidence interval; HR, hazard ratio; PTSD, posttraumatic stress disorder.
*p < 0.05
**p < 0.01