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Table 2 Fukuda definition-positive subjects conforming or not conforming to the Canadian case definition

From: A Disease Register for ME/CFS: Report of a Pilot Study

  Cases fulfilling case definition (n = 122) Cases not fulfilling case definition (n = 87) 95% confidence interval (difference in percentages)
  No. % total No. % total  
Age Group: < 25 1 0.8 4 4.6 -8.6 - 1.0
   25-34 15 12.3 6 6.9 -2.7 - 1.5
   35-44 32 26.2 19 21.8 -7.5 - 1.3
   45-54 43 35.2 28 32.2 -10.2 - 1.3
   55-64 27 22.1 30 34.5 -25.0 - 0.3
   65+ 4 3.3 1 1.1 -1.8 - 6.1
Sex: Male 25 20.5 15 17.2 -7.7 - 14.2
   Female 97 79.5 72 82.8 -14.2 - 7.7
How often do you have tiredness/fatigue?      
   Occasionally 0 0.0 1 1.1 -3.4 - 1.1
   < 3 times/week 0 0.0 7 8.0 -13.9 - -2.2
   Every day or nearly every day 122 100.0 79 90.8 3.0 - 15.4
Were your activities (personal, social, professional, at home) affected by the symptoms of tiredness/fatigue?      
   Not at all 0 0.0 0 0.0 0.0- 0.0
   A little 0 0.0 0 0.0 0.0- 0.0
   Needed to reduce 11 9.0 36 41.4 -44.1 - -20.6
   Can no longer do 111 91.0 51 58.6 20.6 - 44.1
Would you say that your activities were reduced to < 50% than before you fell ill?      
   Yes, by > 50% 116 95.1 70 80.5 5.3 - 24.0
   No, by 50% or less 4 3.3 10 11.5 -15.8 - -0.7
   Don't know 2 1.6 6 6.9 -11.2 - 0.6
Would you say that your fatigue is debilitating and affects your mental and physical functioning?      
   Yes 122 100.0 79 90.8 3.0 - 15.4
   No 0 0.0 4 4.6 -9.1 - -0.1
   Don't know 0 0.0 3 3.4 -7.4 - 0.5
Pain level (where 0 = no pain, and 10 = pain as bad as possible)      
   Mean 6.0 4.6  
   95% confidence interval 5.6 - 6.4 2.5 - 3.1  
   Standard deviation 2.4 2.8  
   Median 6 5  
   Interquartile range 5-8 2-7  
   No. reporting no pain 2 9  
   No. reporting maximum pain 5 3  
Fatigue level on recruitment (where 0 = no problem, and 100 = the most severe health impediment)      
   Mean 65.7 54.3  
   95% confidence interval 61.0 - 70.4 50.0 - 58.6  
   Standard deviation 26.1 21.0  
   Median 70 50  
   Interquartile range 50-80 50-70  
   No. reporting no fatigue 2 2  
   No. reporting max. possible fatigue 15 1