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Table 5 Fibromyalgia (1990 Criteria) [8] and pressure - induced pain thresholds in Cohort 2 (mean [95% confidence intervals]; probability).

From: Migraine headaches in Chronic Fatigue Syndrome (CFS): Comparison of two prospective cross-sectional studies

  HC All CFS CFS+MO CFS+MA CFS+T
  n = 20 N = 67 n = 40 n = 16 n = 10
Widespread pain 10.0% 50.0%
P = 0.0010*
55.3%
p = 0.0006*
46.2
p = 0.02*
33.3%
Manual pressure at ≥ 11/18 Points 5.6% 55.4%
p = 0.00005*
64.1%
p = 0.000013*
56.3%
p = 0.001*
20.0%
p = 0.014**
Fibromyalgia 0% 37.7%
P = 0.0004*
47.4%
P = 0.00007*
28.5%
p = 0.022*
11.1%
p = 0.03**
Systemic pain threshold (kg) 5.23
[3.95-6.52]
2.90
[2.47-3.32]
p = 0.0002
2.36
[1.95-2.78]
P = 0.00001
3.51
[2.53-4.48]
3.94
[2.67-5.20]
p = 0.025 ††
Sinus pain threshold (kg) 1.91
[0.37-2.45]
p = 0.0002 0.87
[0.71-1.03]
p = 0.0001
1.18
[0.86-1.51]
1.30
[0.90-1.71]
  1. Fisher's Exact Test vs.* HC and vs. ** CFS+MO. 2-tailed unpaired Student's tests with Bonferonni corrections following ANOVA (p < 0.05) vs. HC and vs. †† CFS+MO.