Table 1.

Analysis of tinnitus occurrence in women who used oral hormonal contraception for six months or more (risk group), and in women who had never used it (control group).

		Tinnitus
Group		Present	Absent	Total
Risk	n	10	20	30
	%	33,3	66,7	100,0
Control	n	0	30	30
	%	0	100,0	100,0
Total	n	10	50	60
	%	16,7	83,3	100,0

x² = 12.00 and p value = 0.001