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Table 3 Clinical characteristics of CFS subjects at initial classification (N = 65)

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

Characteristic Description
Age at onset (mean, standard deviation, range) in years 37.1 (11.0, 5–57)
Median proportion of life with illness* 13.0
Self reported onset type (%)  
   Gradual 76.9
   Sudden 20.0
   Don't know/declined reply 3.1
Body mass index (%)  
   20–24: Normal 26.2
   25–29: Overweight 33.8
   ≥ 30:Obese 40.0
   Median (interquartile range) 27 (24–31)
Ever been diagnosed or treated by a physician (%)  
   Fibrositis or fibromyalgia 32.3
   Depression 30.8
   Allergies confirmed by formal testing 21.5
   Irritable bowel syndrome 18.5
   Temporomandibular joint syndrome 16.9
   CFS 13.9
   Environmental sensitivity disease 1.5
   Yeast infection (only females) 48.2
Diagnostic Interview Schedule (%)  
   Current/Lifetime somatization 0
   Lifetime major depression disorder 16.9
  1. * Ratio between illness duration (in years) and age (in years)