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Table 4 Evaluation of efficacy by patient

From: Improvement of migraine symptoms with a proprietary supplement containing riboflavin, magnesium and Q10: a randomized, placebo-controlled, double-blind, multicenter trial

  Verum Placebo P value
  N = 55 N = 57  
Mean (SD) 2.6 (1.09) 3,2 (0.81) 0.01
very good n (%) 10 (18.2) 0 (0)  
good n (%) 16 (29.1) 14 (24.6)  
moderate n (%) 13 (23.6) 18 (31.6)  
poor n (%) 16 (29.1) 25 (43.9)