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