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Table 8 Effect of fibromyalgia (FM) comorbidity, gender and allodynia on the primary outcome (50% headache frequency reduction)

From: Failure of preventive treatments in migraine: an observational retrospective study in a tertiary headache center

  Outcome Odds ratio 95% CI z statistic Significance level
< 50% > 50%     
FM comorbidity no 571 299 1.58 1.05 to 2.38 2.2 P = 0.02
yes 106 35     
Gender M 180 94 1.08 0.8 to 1.44 0.523 P = 0.6
F 497 240     
Allodynia No 73 67 0.5 0.35 to 0.72 3.67 P = 0.0002
Yes 594 277