Table 6.

The onset of sentinel headache before stroke in relation to the time of stroke or headaches during seven days before admission of the control group

The time/day of development of headache	Hours before stroke/admission of controls	1 day before stroke/admission of controls	2 days before stroke/admission of controls	3 days before stroke/admission of controls	4 days before stroke/admission of controls	5 days before stroke/admission of controls	6 days before stroke/admission of controls	7 days before stroke/admission of controls	Total
A new type of headache (n=27)	10 (0)	5 (0)	8 (0)	3 (0)	1 (0)	0 (0)	0 (0)	0 (0)	27(0)
Headache with altered characteristic (n=54)	13 (0)	6 (1)	7 (1)	1 (0)	4 (0)	7 (0)	6 (0)	10 (0)	54(2)
The previous headache without changes (n=13)	2 (1)	5 (3)	3 (2)	2 (2)	1 (2)	0 (0)	0 (0)	0 (0)	13(10)