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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: Am J Geriatr Psychiatry. 2015 May 16;24(3):181–191. doi: 10.1016/j.jagp.2015.05.004

FIGURE 2. Weighted prevalence of lifetime and current PTSD by combat exposure and age cohort.

FIGURE 2

a PTSD defined according to DSM-tV criteria denved from the CID1-IV.

b Test statisticsfor combat exposure with lifetime PTSD prevalence: t(274) = 4.18, p < 0.001 for <60 age and t(1834) = 7.34, p < 0.001 for ≥60 age; combat by age cohort interaction t(2108) = 0.17, p = 0.86. Test statisticsfor combat exposure with current PTSD prevalence: t(273) = 3.60, p < 0.001 for <60 age and t(1831) = 6.92 p < 0.001 for ≥60 age; combat by age cohort interaction t(2104) = 0.47, p = 0.64.

c Prevalence is estimated from theater service Veterans with valid responses. Error bars represent 95% confidence intervals that account for clustering by twin pairs Weighted for non-response and to the characteristics of the living male US population of Vietnam-theater Veterans.