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Table 6 Changes in CFS classification (%)

From: A population-based study of the clinical course of chronic fatigue syndrome

Classification 1-year follow-up (N = 59) 2-years follow-up (N = 39) 3-years follow-up (N = 24)
CFS 32.2 20.5 20.8
Insufficient symptoms or fatigue severity 30.5 30.8 37.5
Not fatigued 15.3 18.0 20.8
Exclusionary conditions    
   Permanent medical or psychiatric* 8.5 15.4 16.7
   Temporary medical† 13.6 15.4 4.2
  1. *Permanent exclusions include bulimia, bipolar disease, chronic hepatitis, body mass index = 47, Sjögren's syndrome, diabetes with complications, multiple sclerosis, inflammatory bowel disease (2 subjects), sleep apnea or narcolepsy (3 subjects) and major depressive disorder with melancholia (3 subjects) † Temporary exclusions include abnormal urinalysis, beta-blocker medication, results for positive Romberg's test, rheumatoid factor, abnormal liver function, hypertension, breast mass, multiple myeloma, and thyroid disease.