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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Psychosomatics. 2012 Jan 31;53(3):250–257. doi: 10.1016/j.psym.2011.08.007

Table 2.

Unadjusted, adjusted, and within-twin pair odds ratios (OR) and 95% confidence intervals (CI) for the associations between CFS, PTSD, and IES.

Trauma Variables Overall Unadjusted OR1 (95% CI) Overall Adjusted OR2 (95% CI) Within-twin Pair Adjusted OR3 (95% CI)
Lifetime History of PTSD 8.7 (6.0–12.6) 7.5 (5.0–11.0) 5.2 (3.4–7.9)
IES Score ≥ 26 4.1 (3.0–5.7) 4.3 (3.1–6.0) 1.7 (1.2–2.4)
1

ORs describe the association between CFS, PTSD, and dichotomized IES score while taking into account the relatedness of twin pairs.

2

ORs describe the association between CFS, PTSD, and dichotomized IES score, adjusted for age, sex, and race, while taking into account the relatedness of twin pairs.

3

ORs describe the association between CFS, PTSD, and dichotomized IES score, adjusted for age, sex, race, and familial confounding.