Table 4. Multivariable analysis using generalized estimating equations (GEE).

OR: odds ratio; CI: confidence interval  

A p-value of <0.05 was considered significant.

Characteristics	OR	95% CI	P-value
Female age	1.12	[1.02 - 1.23]	0.02
Male age	0.99	[0.92 - 1.06]	0.75