Phenotypic features of chronic migraine

Table 6 Duration of illness (months) according to accompanying symptoms

Accompanying symptoms		Number of subjects (n)	Duration of illness (months)	P value
Nausea	Present	612	60 [24–156]	<0.001
Nausea	Absent	177	36 [10–114]	<0.001
Vomiting	Present	302	108 [36–180]	<0.001
Vomiting	Absent	436	36 [12–120]	<0.001
Phonophobia	Present	635	60 [24–156]	<0.001
Phonophobia	Absent	157	36 [9–96]	<0.001
Photophobia	Present	560	72 [24–166]	<0.001
Photophobia	Absent	227	36 [12–96]	<0.001
Dizziness	Present	116	114 [36–240]	<0.001
Dizziness	Absent	545	48 [12–120]	<0.001
Vertigo	Present	92	82 [24–180]	0.015
Vertigo	Absent	549	48 [12–120]	0.015
Osmophobia	Present	127	120 [48–240]	<0.001
Osmophobia	Absent	111	48 [12–120]	<0.001

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