Table 3.

Multiple logistic regression analysis

Variables	OR	95% CI	p value
Age (years)	1.052	1.027–1.079	<0.001
Volume quartiles
12–34 (cc)	3.942	2.148–7.234	<0.001
35–47 (cc)	2.071	1.141–3.756	0.017
48–66 (cc)	1.304	0.689–2.466	0.414
67–253 (cc)
Free/total PSA (ng/mL)	0.105	0.011–0.996	0.047
PSA density	2.422	0.755–7.771	0.137
No. cores	1.067	1.017–1.119	0.008

OR: odds ratio; CI: confidence interval; PSA: prostate-specific antigen.