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Table 2 Symptoms of orthostatic intolerance

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

  CFS patients Healthy controls p-value
Dizzy when rising from supine or sitting position - no. (%)    
  No 6 (21) 29 (81) < 0.001
  Yes 23 (79) 7 (19)  
Dizzy after eating a big meal - no. (%)    
  No 26 (93) 35 (97) 0.577
  Yes 2 (7) 1 (3)  
Dizzy after standing upright for a long time - no. (%)    
  No 10 (35) 29 (81) < 0.001
  Yes 19 (66) 7 (19)  
Dizzy during light exercise - no. (%)    
  No 10 (35) 35 (97) < 0.001
  Yes 19 (66) 1 (3)  
Dizzy during a hot bath or shower - no. (%)    
  No 13 (45) 31 (86) < 0.001
  Yes 16 (55) 5 (14)  
Dizzy when seeing blood - no. (%)    
  No 27 (93) 32 (89) 0.684
  Yes 2 (7) 4 (11)  
Dizzy while urinating - no. (%)    
  No 28 (97) 35 (100) 0.453
  Yes 1 (3) 0 (0)  
Orthostatic intolerance, total score – mean (range) 3.6 (7) 0.9 (4) < 0.001
  1. P-values are based on Chi-square test, Fisher's exact test, or Mann-Whitney's test, as appropriate.
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