Phenotypic features of chronic migraine

Table 3 Headache frequency (days/month) according to accompanying symptoms

Accompanying symptoms		Number of subjects (n)	Headache days/month	P value
Nausea	Present	612	20 [15–30]	0.008
Nausea	Absent	177	30 [16–30]	0.008
Vomiting	Present	302	20 [15–30]	<0.001
Vomiting	Absent	436	30 [18–30]	<0.001
Phonophobia	Present	635	20 [15–30]	0.002
Phonophobia	Absent	157	30 [20–30]	0.002
Photophobia	Present	560	20 [15–30]	<0.001
Photophobia	Absent	227	30 [20–30]	<0.001
Dizziness	Present	116	25 [16–30]	0.056
Dizziness	Absent	545	20 [16–30]	0.056
Vertigo	Present	92	25 [16–30]	0.440
Vertigo	Absent	549	24 [16–30]	0.440
Osmophobia	Present	127	20 [16–30]	0.371
Osmophobia	Absent	111	20 [15–30]	0.371

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