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Table 2 Relationship between self-reported fibromyalgia severity and proportion of patients reporting use of medications and core symptoms of fibromyalgia (FM).

From: Toward characterization and definition of fibromyalgia severity

Binary Variable Self-reported FM severity
(percent of patients)
Mantel-Haenszel Χ2
(P value)
  Mild Moderate Severe  
Medications for FM 26.7 65.5 84.0 16.54 (< 0.0001)
Sleep problems 40.0 72.9 90.4 15.99 (< 0.0001)
Symptoms of depression 6.7 52.5 65.4 13.14 (< 0.001)
Symptoms of anxiety 20.0 52.5 61.5 6.56 (< 0.05)
Back pain 46.7 72.9 82.7 6.90 (< 0.01)
Neck pain 26.7 72.9 71.2 5.52 (< 0.05)
  1. Mantel-Haenszel chi-square tests for trend (d.f. = 1) of the proportions of patients reporting use of medications and core symptoms of fibromyalgia by severity of fibromyalgia.