Table 3.

Analysis of the occurrence of sporadic headaches in women who used the oral hormonal contraception method for six months or more (risk group), an in women who had never used it (control group).

		Sporadic headaches
Group		Present	Absent	Total
Risk	n	23	7	30
	%	76,7	23,3	100,0
Control	n	21	9	30
	%	70,0	30,0	100,0
Total	n	44	16	60
	%	73,3	26,7	100,0

x² = 0.341 and p value = 0.559