Table 3.

Frequency of Primary Headache and Its Association with Menstruation

	Non MRH n=97(100)	MRH n=26(100)	χ2	RR (95% CI)	P value
Migraine	20(20.6)	12(46.2)	6.95	3.30(1.32–8.24)	0.008*
Probable migraine	7(7.2)	4(15.3)	1.68	2.34(0.63–8.69)	0.195
All migraine	27(27.8)	16(61.5)	10.24	2.65(1.06–6.63)	0.001*
TTH	66(68.04)	9(34.6)	9.63	0.25(0.10–0.62)	0.002*
Unclassifiable	4(4.1)	1(3.5)	1.00ǂ	1.06(0.18–6.33)	0.715

Notes: ^ǂFishers exact chi–square; *Significant value (P< 0.05).

Abbreviation: TTH, tension-type headache.