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Table 2 Characteristics of Study Sample (n=499)

From: Methods of applying the 1994 case definition of chronic fatigue syndrome – impact on classification and observed illness characteristics

  All Subjects (n=499) Classified as CFS
1994 Case Definition Method
   Method 1 (n=59) Method 2 (n = 71)
Characteristicsa [values are n (%)    
Age in Yrs, Mean (SD) 47.61 (9.84) 46.76 (9.82) 47.93 (9.90)
Sex    
 Female 367 (73.55) 49 (83.05) 65 (91.55)
 Male 132 (26.45) 10 (16.95) 6 (8.45)
Race    
 Black 98 (19.64) 8 (13.56) 12 (16.90)
 White 394 (78.96) 48 (81.36) 56 (78.87)
 All Others 7 (1.40) 3 (5.08) 3 (4.23)
Geographic Area    
 Metropolitan 93 (18.64) 7 (11.86) 8 (11.27)
 Urban 161 (32.26) 29 (49.15) 39 (54.93)
 Rural 245 (49.10) 23 (38.98) 24 (33.80)
Married 351(70.62) 38 (64.41) 46(64.79)
Education    
 ≤ High School 99 (19.84) 15 (25.42) 17 (23.94)
 Some College 165 (33.07) 22 (37.29) 27 (38.03)
 ≥ College 233 (46.69) 22 (37.29) 27 (38.03)
Type of onset    
 Sudden n/a 10 (16.95) 11 (15.49)
 Gradual n/a 46 (77.97) 36 (50.70)
 Not known n/a 3 (5.08) 24 (33.80)
Duration Fatigue in Yrs, Mean (SD) n/a 12.13(8.92) 12.26 (9.87)
  1. n/a not applicable
  2. aValues are n (%) unless otherwise indicated