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

BMC Neurology

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

		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
FM comorbidity	yes	106	35
Gender	M	180	94	1.08	0.8 to 1.44	0.523	P = 0.6
Gender	F	497	240
Allodynia	No	73	67	0.5	0.35 to 0.72	3.67	P = 0.0002
Allodynia	Yes	594	277

ISSN: 1471-2377