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. 2015 Nov;60(11):488–496. doi: 10.1177/070674371506001104

Figure 2b.

Figure 2b

Kaplan–Meier curves for posttraumatic stress disorder (PTSD) persistence according to deployment and age of PTSD onset

Cohort 1: deployment-unrelated trauma, age of onset: 18 to 30 (n = 117)

Cohort 2: deployment-unrelated trauma, age of onset: ≥31 (n = 57)

Cohort 3: deployment-related trauma, age of onset: 18 to 30 (n = 114)

Cohort 4: deployment-related trauma, age of onset: ≥31 (n = 69)

Testing homogeneity of survival curves over strata: χ2 = 6.58, df = 3, P = 0.09 (unweighted results)