TABLE 3.

Baseline posttraumatic stress disorder (PTSD) status predicting probable PTSD a year later over five waves (6 years) and annual excess fraction of probable PTSD attributable to baseline PTSD and subthreshold PTSD

PTSD status	PTSD
	Relative Risk (95% CI)	Annual Excess Fraction (95% CI)
PTSD	7.16 (5.97, 8.59)	28.0% (21.8%, 33.8%)
Subthreshold PTSD Definition 1	3.19 (2.47, 4.13)	36.4% (27.4%, 44.3%)
Subthreshold PTSD Definition 2	3.68 (2.88, 4.71)	35.9% (26.9%, 43.9%)
Subthreshold PTSD Definition 3	3.39 (2.62, 4.39)	35.0% (26.0%, 42.9%)

Notes. Persons with PTSD screened positive for a DSM-IV-TR Criterion A event, Criterion B, Criterion C, Criterion D, Criterion E, and Criterion F. Sub Def 1 persons screened positive for a DSM-IV-TR Criterion A event, Criterion B, Criterion C or Criterion D, plus Criterion E and Criterion F. Sub Def 2 Persons screened positive for a DSM-IV-TR Criterion A event, two of the three Criterion B, Criterion C, or Criterion D, plus Criterion E and Criterion F. Sub Def 3 persons screened positive for a DSM-IV-TR Criterion A event, a response of 3–5 (Moderately or above) on at least 1 Criterion B item, 1 Criterion C item, and 1 Criterion D item, plus Criterion E and Criterion F. CI, confidence interval; PTSD, posttraumatic stress disorder