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A Twin Study of Chronic Fatigue

Dedra Buchwald, MD, Richard Herrell, PhD, Suzanne Ashton, BS, Megan Belcourt, BS, Karen Schmaling, PhD, Patrick Sullivan, MD, Michael Neale, PhD and Jack Goldberg, PhD

From the Departments of Medicine (D.B., S.A., M.B.) and Psychiatry and Behavioral Sciences (K.S.), University of Washington, Seattle, WA; the Division of Epidemiology–Biostatistics (J.G., R.H.), University of Illinois, Chicago, IL; and the Virginia Institute for Psychiatric and Behavioral Genetics (P.S., M.N.), Virginia Commonwealth University, Richmond, VA.



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  		Fig. 1. Estimates of genetic and environmental influence on the liability to chronic fatigue with 95% confidence intervals.

 




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