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Table 1 Background characteristics

From: Orthostatic responses in adolescent chronic fatigue syndrome: contributions from expectancies as well as gravity

  CFS patients (n = 30) Healthy controls (n = 39) p-value
Sex - no. (%)    
  Male 9 (30) 11 (28) 0.871
  Female 21 (70) 28 (72)  
Ethnicity – no. (%)    
  Scandinavian 30 (100) 37 (95) 0.501
  Not scandinavian 0 (0) 2 (5)  
Age - years, mean (SD) 15.2 (1.7) 15.2 (1.6) 0.889
BMI - kg/m2, mean (SD) 21.8 (4.5) 20.3 (2.9) 0.116
Alcoholic beverages - no. (%)    
  Never 24 (83) 28 (78) 0.618
  Occationally 5 (17) 8 (22)  
Tobacco products - no. (%)    
  Never 24 (86) 29 (78) 0.450
  Occationally 4 (14) 8 (22)  
Narcotics/illigal drugs - no. (%)    
  Never 27 (100) 34 (92) 0.257
  Occationally 0 (0) 3 (8)  
School absenteism - %, mean (SD) 64 (30) 2 (7) <0.001
Adheres to Fukuda-criteria - no. (%)    
  No 9 (31) n.a. n.a.
  Yes 20 (69)   
Disease duration - months, median (range) 19 (56) n.a. n.a.
  1. P-values are based on Chi-square test, Fisher's exact test, Student t-test or Mann-Whitney's test, as appropriate. SD = standard deviation, IQR = interquartile range, n.a. = not applicable, BMI = body mass index, Fukuda-criteria = The CFS diagnostic criteria from the International Chronic Fatigue Syndrome Study Group [1].