Table 3.

Odds ratios (95% confidence intervals) of tinnitus according to menstrual cycle characteristics.

	Model 1	Model 2
Regular menstrual cycle	1	1
Irregular menstrual cycle with duration of up to 3 months	1.41 (1.09–1.82)	1.37 (1.06–1.78)
Irregular menstrual cycle with duration of longer than 3 months	1.77 (1.05–2.97)	1.71 (1.03–2.85)
p for trend	0.001	0.002

Model 1 was adjusted for age, smoking status, alcohol intake, physical activity, parity, and body mass index.

Model 2 was adjusted for age, smoking status, alcohol intake, physical activity, parity, body mass index, educational level, household income level, sleep duration, use of oral contraceptives, psychological stress, and depressive mood.