Table 1.

Descriptive statistics of the 3 cohorts.

Characteristics	Cohort 1a (N=261), n (%)	Cohort 2 (N=352), n (%)	Cohort 3 (N=232), n (%)
Age (years)b	30.6 (8.2)	31.3 (9.9)	31.1 (8.7)
Gender (female)	20 (7.7)	21 (6.0)	19 (8.2)
Previously deployed (yes)	162 (62.3)	193 (55.0)	147 (63.6)
Military rank (private)	154 (59.2)	193 (55.0)	110 (47.6)
Screening-level PTSDc at 6 months	22 (8.5)	35 (10.0)	18 (7.8)
Screening-level PTSD at the 2.5-year or 6.5-year follow-up	71 (27.3)	76 (21.7)	54 (23.4)

^aDescriptive statistics for cohort 1 are based on the sample who provided outcome data at 6.5 years. Minor differences might be observed in the sample providing outcome data at 2.5 years.

^bmean (SD).

^cPTSD: posttraumatic stress disorder.