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Table 1 Average annual percent change in the incidence rate for PTSD prior to and following the initiation of Combat Operations in Iraq

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

Item Baseline 1999–2002 During OIF 2003–2008
Annual change (%) 95% CI p Annual change (%) 95% CI p
All active-dutya 5.0 1.9, 8.3 0.002 43.0 40.6, 45.6 < 0.001
Sexb
 Female −1.3 −5.1, 2.6 0.496 15.6 12.5,18.7 < 0.001
 Male 10.4 6.4, 14.4 < 0.001 53.8 50.9,56.8 < 0.001
Ageb
  < 20 −4.7 −11.5, 2.6 0.205 12.4 6.3, 18.8 < 0.001
 20–24 4.8 0.1, 9.7 0.045 40.4 36.8, 44.1 < 0.001
 25–29 8.6 1.6, 16.1 0.015 47.8 42.5, 53.3 < 0.001
 30–34 9.1 0.0, 19.0 0.049 48.1 41.2, 55.4 < 0.001
 35–40 8.0 −2.3, 19.3 0.133 53.7 45.3, 62.6 < 0.001
  > 40 8.0 −3.4, 20.8 0.178 50.7 42.0, 59.8 < 0.001
Raceb
 Black 3.3 −3.9, 11.1 0.374 44.8 38.6, 51.2 < 0.001
 Other 8.9 −0.3, 18.9 0.059 45.3 38.6, 52.4 < 0.001
 White 4.8 1.0, 8.7 0.012 42.3 39.4, 45.3 < 0.001
Marital Statusb
 Married 11.5 6.6, 16.5 < 0.001 48.6 45.1, 52.2 < 0.001
 Other 4.5 −7.4, 17.9 0.479 41.3 31.7, 51.5 < 0.001
 Single −0.9 −4.9, 3.3 0.669 35.4 32.0, 38.9 < 0.001
Rankb
 E1-E4 2.6 −1.0, 6.3 0.156 35.4 32.5, 38.3 < 0.001
 E5-E9 9.4 3.3, 15.9 0.002 56.3 51.6, 61.1 < 0.001
 O1-O3 8.9 −7.5, 28.3 0.305 42.9 30.6, 56.3 < 0.001
 O4-O9 26.8 1.6, 58.4 0.036 35.0 21.8, 49.6 < 0.001
Serviceb
 Army 8.2 3.7, 12.8 < 0.001 53.2 49.8, 56.7 < 0.001
 Marines 14.5 5.0, 24.9 0.002 50.7 44.2, 57.5 < 0.001
 Navy −3.0 −7.8, 2.0 0.228 21.6 17.4, 25.9 < 0.001
 Air Force 6.8 0.3, 13.6 0.039 23.0 18.4, 27.9 < 0.001
  1. a Adjusted for sex, age, race, marital status, military rank, and branch of military service; b Adjusted for all other variables in the table