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Table 5 Number of patients with favorable (reduction in headache frequency >  50%) and unfavorable (< 50%) outcomes after 3 months of treatment. The odds ratio was computed for a single drug compared with the remaining population

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

  Beta-blockers Calcium channel blockers Antidepressants Integrators Antiepileptics Sartans Total
< 50% 28 98 288 40 196 27 677
> 50% 17 67 137 24 80 9 334
  45 165 425 64 276 36 1011
Odds ratio 1.23 1.48 0.93 1.23 0.77 0.66  
95% CI 0.67 to 2.30 1.05 to 2.08 0.71 to 1.2 0.71 to 2.08 0.57 to 1.046 0.3 to 1.4  
z statistic 0.69 2.25 0.461 0.78 1.67 1.037  
Sig. level P = 0.48 P = 0.02 P = 0.64 P = 0.43 P = 0.09 P = 0.29