Table 3. Use of HRT and the risk of tinnitus.

HRT (With vs. without)	With			Without			Ratio	Adjusted HR	95% CI	95% CI	P
Kinds of HRT	Event	PYs	Rate (per 105 PYs)	Event	PYs	Rate (per 105 PYs)
Total	60	84, 573.38	70.94	246	260, 443.28	94.45	0.751	0.505	0.342	0.756	0.001
Estrogen only	38	48, 965.12	77.61	246	260, 443.28	94.45	0.822	0.538	0.385	0.902	0.003
Estrogen and progestogen	22	35, 608.26	61.78	246	260, 443.28	94.45	0.654	0.468	0.272	0.693	<0.001

Abbreviations: PYs = Person-years; Adjusted HR = Adjusted Hazard ratio: Adjusted for the variables listed in Table 2.; CI = confidence interval.