Association between Body Mass Index and Migraine: A Survey of Adult Population in China

Table 5

There was no association between the duration of headache attacks and BMI in EM.

Weight category	<4 h		4–72 h		>72 h
	n	(%)	n	(%)	n	(%)
Underweight ()	6	37.5	7	43.8	3	18.8	0.2415
Normal ()	25	20.8	84	70	11	9.2	0.8176
Overweight ()	6	24	14	56	5	20	0.0529
Obese/morbidly obese ()	0	0	3	60	2	40	0.2076