Table 6. Confounding analysis.

Covariates	Univariate analysis			Multivariate analysis
	P	OR	95%CI	P	OR	95%CI
Onset of meningioma	0.151	0.988	0.972-1.004	0.657	0.992	0.959-1.027
Family history	0.999	-	-	0.999	-	-
Onset of contraception use	0.668	0.967	0.828-1.129	0.81	0.975	0.794-1.197
Type of hormonal contraception	0.999	-	-	0.999	-	-
Duration of hormonal contraception	0.607	0.997	0.987-1.007	0.573	0.996	0.98-1.011
Parity	0.095	0.522	0.244-1.12	0.495	0.692	0.241-1.988
Age of menarche	0.284	0.759	0.457-1.258	0.419	0.762	0.394-1.473
Menstrual cycle	0.497	1.585	0.419-5.992	0.999	-	-