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Mayo study of CFS incidence and classification in a Minnesota county
Wednesday 14 November 2012
By Ann Vincent, MD, et al.
Patients and Methods: We conducted a retrospective medical record review of potential cases of chronic fatigue syndrome identified from January 1, 1998, through December 31, 2002, using the Rochester Epidemiology Project, a population-based database.
Patients were classified as having chronic fatigue syndrome if the medical record review documented fatigue of 6 months' duration, at least 4 of 8 chronic fatigue syndrome-defining symptoms, and symptoms that interfered with daily work or activities.
Patients not meeting all of the criteria were classified as having insufficient/idiopathic fatigue.
We identified 686 potential patients with chronic fatigue, 2 of whom declined consent for medical record review. Of the remaining 684 patients, 151 (22%) met criteria for chronic fatigue syndrome or insufficient/idiopathic fatigue.
The overall prevalence and incidence of chronic fatigue syndrome and insufficient/idiopathic fatigue were:
The potential cases included 482 patients (70%) who had an exclusionary condition, and almost half the patients who met either criterion had at least one nonexclusionary comorbid condition.
Careful clinical evaluation to identify whether fatigue could be attributed to exclusionary or comorbid conditions rather than chronic fatigue syndrome itself will ensure appropriate assessment for patients without chronic fatigue syndrome.
Source: Mayo Clinic Proceedings, Nov 8, 2012. Vincent A, Brimmer DJ, Whipple MO, Jones JF, Boneva R, Lahr BD, Maloney E, St. Sauver JL, Reeves, WC. Fibromyalgia and Chronic Fatigue Clinic, Division of General Internal Medicine, Division of Biomedical Statistics and Informatics, Division of Epidemiology, Mayo Clinic, Rochester, MN; Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA; McKing Consulting, Atlanta, GA.
The above originally appeared here.
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