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Table 2 Incidence rates and rate ratios for PTSD by demographic and occupational factors among active-duty US service members between 1999 and 2008

From: Trends in the incidence of physician-diagnosed posttraumatic stress disorder among active-duty U.S. military personnel between 1999 and 2008

Item Cases % Person-years PTSD rate (cases)a 95% CI Unadjusted rate ratio (95% CI) Adjusted rateb ratio (95% CI)
Sex
 Female 11,396 21.58 1,966,227 5.80 5.44, 6.17 1.65 1.54, 1.77 1.92 1.84, 2.00
 Male 41,410 78.42 11,783,519 3.51 3.40, 3.63 (ref) (ref)
Age
  < 20 3565 6.75 1,103,833 3.23 2.89, 3.61 (ref) (ref)
 20–24 20,745 39.29 4,540,468 4.57 4.36, 4.79 1.41 1.25, 1.60 1.36 1.27, 1.46
 25–29 12,645 23.95 2,885,197 4.38 4.13, 4.65 1.36 1.20, 1.54 1.52 1.41, 1.65
 30–34 6526 12.36 2,021,167 3.23 2.97, 3.51 1.00 0.87, 1.15 1.37 1.25, 1.50
 35–39 5116 9.69 1,800,101 2.84 2.59, 3.12 0.88 0.76, 1.02 1.37 1.24, 1.52
  > 39 4209 7.97 1,398,980 3.01 2.71, 3.33 0.93 0.80, 1.08 1.68 1.51, 1.87
Race
 Black 7966 15.09 2,654,476 3.00 2.79, 3.23 (ref) (ref)
 Other 6772 12.82 1,708,460 3.96 3.66, 4.30 1.32 1.18, 1.47 1.45 1.36, 1.54
 White 38,068 72.09 9,386,810 4.06 3.92, 4.20 1.35 1.25, 1.47 1.58 1.51, 1.66
Marital Status
 Married 29,318 55.52 7,403,616 3.96 3.81, 4.11 1.13 1.06, 1.20 1.38 1.32, 1.44
 Other 3172 6.01 568,459 5.58 4.97, 6.27 1.59 1.40, 1.80 1.72 1.59, 1.86
 Single 20,316 38.47 5,777,671 3.52 3.36, 3.68 (ref)   (ref)  
Rank
 E1-E4 29,302 55.49 6,044,647 4.85 4.67, 5.03 3.90 3.19, 4.77 4.93 4.31, 5.63
 E5-E9 20,640 39.09 5,501,415 3.75 3.59, 3.92 3.02 2.47, 3.70 3.42 3.02, 3.89
 O1-O3 1791 3.39 1,339,516 1.34 1.15, 1.56 1.08 0.84, 1.38 1.17 1.00, 1.36
 O4-O9 1073 2.03 864,168 1.24 1.02, 1.51 (ref) (ref)
Service
 Air Force 5747 10.88 3,502,310 1.64 1.52, 1.77 (ref) (ref)
 Army 30,572 57.89 4,904,786 6.23 6.04, 6.44 3.80 3.50, 4.12 3.80 3.59, 4.02
 Marines 8440 15.98 1,776,267 4.75 4.47, 5.05 2.90 2.63, 3.19 2.92 2.73, 3.12
 Navy 8047 15.24 3,566,383 2.26 2.12, 2.40 1.38 1.25, 1.52 1.51 1.41, 1.61
  1. a Unadjusted incidence rate of PTSD per 1000 person-years; b Adjusted for all other variables in the table; (ref). Reference category for incidence rate ratio comparisons per variable