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

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