Table 3. Univariate and multivariate logistic regression analysis of covariate influence on prostatic calculi.

	Univariate OR (95% CI)	Multivariate-adjusted OR (95% CI)
Age (years)
< 65 years	1.00	1.00
≥ 65 years	2.27 (1.71–3.01)	1.76 (1.30–2.39)
P-value	< 0.001	< 0.001
Prostate volume
< 25 mL	1.00	1.00
≥ 25 mL	2.00 (1.50–2.69)	1.71 (1.26–2.32)
P-value	< 0.001	0.001
Prostatitis
Negative	1.00
Positive	1.47 (0.98–1.75)
P-value	0.109

Abbreviations: CI, confidence interval; OR, odds ratio.