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Table 7 Impact of Fibromyalgia on Productivity over the Past 4 Weeks, Overall and by Fibromyalgia Severity Level

From: The comparative burden of mild, moderate and severe Fibromyalgia: results from a cross-sectional survey in the United States

   Severity Level  
  Overall Mild Moderate Severe p-value a
Days missed from work due to FMb      0.030
   n 78 14 29 35  
   mean (SD) 1.8 (3.9) 0.4 (0.9) 1.0 (1.4) 3.0 (5.4)  
   median (range) 0.0 (0.0-28.0) 0.0 (0.0-3.0) 0.0 (0.0-4.0) 1.0 (0.0-28.0)  
Days worked with symptoms related to FMb      < 0.001
   n 81 15 30 36  
   mean (SD) 15.6 (9.0) 6.9 (7.4) 15.3 (7.7) 19.4 (8.2)  
   median (range) 17.0 (0.0-28.0) 5.0 (0.0-28.0) 17.0 (0.0-28.0) 20.0 (0.0-28.0)  
Average effectiveness at work on days with FM symptomsb      0.002
   n 70 11 28 31  
   mean (SD) 75.3 (18.3) 89.8 (11.0) 77.7 (15.1) 67.9 (19.7)  
   median (range) 80.0 (20.0-100.0) 90.0 (70.0-100.0) 80.0 (30.0-100.0) 75.0 (20.0-100.0)  
Hours of unpaid caregiver help for FM in activities of daily living      0.003
   n 203 21 49 133  
   mean (SD) 29.1 (88.5) 3.6 (7.0) 22.8 (100.3) 35.4 (90.4)  
   median (range) 5.0 (0.0-720.0) 0.0 (0.0 - 30.0) 0.0 (0.0 - 700.0) 8.0 (0.0 - 720.0)  
  1. a Kruskal-Wallis test.
  2. b Among subjects employed for pay (full-time or part-time).
  3. Source: Subject Questionnaire.