Table 4. Multiple logistic regression analysis and associated factors for retinal drusen in 232 male and 713 female monkeys.

Variables	Odds ratio (Unit)	95% CI	P value	VIF
Male (N = 232)
Age	1.07 (per 1 year)	1.02–1.13	0.003	1.03
RBC	1.00 (per 1x104/μl)	0.99–1.01	0.119	1.05
BUN	0.96 (per 1 mg/dl)	0.90–1.01	0.136	1.05
Female (N = 713)
Age	1.10 (per 1 year)	1.07–1.13	<0.001	-

RBC, red blood cell; BUN, blood urea nitrogen; CI, confidence interval; VIF, variance inflation factor.