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Mayo Study of CFS Incidence & Classification in a Minnesota County

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www.ProHealth.com • November 10, 2012

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Article:
Prevalence, Incidence, and Classification of Chronic Fatigue Syndrome in Olmsted County, Minnesota, as Estimated Using the Rochester Epidemiology Project
- Source: Mayo Clinic Proceedings, Nov 8, 2012

By Ann Vincent, MD, et al.

Abstract:
Objective: To estimate the prevalence and incidence of chronic fatigue syndrome in Olmsted County, Minnesota, using the 1994 case definition and describe exclusionary and comorbid conditions observed in patients who presented for evaluation of long-standing fatigue.

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.

Results:

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:

• 71.34 per 100,000 persons and 13.16 per 100,000 person-years [CFS]

• vs 73.70 per 100,000 persons and 13.58 per 100,000 person-years [insufficient/idiopathic fatigue], respectively.

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.

Conclusion:
The incidence and prevalence of chronic fatigue syndrome and insufficient/idiopathic fatigue are relatively low in Olmsted County. [Note: The population of Olmsted County, a sparsely populated largely agricultural county, was 124,277 in 2000, so at 71.34 CFS cases per 100,000 the county total would have been roughly 88 cases using the Fukuda 1994 case definition.]

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.



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