Table 4.

Univariate and multivariate analyses of associations between various parameters and stone-specific survival

Variable	Univariate analysis			Multivariate analysis
	HR	95% CI	p value	HR	95% CI	p value
Age, year	1.10	1.02–1.22	<0.01	1.01	0.91–1.14	0.90
Female (vs Male)	4.59	0.83–85.69	0.08	3.80	0.39–95.67	0.27
Charlson Comorbidity Index	1.21	0.79–1.78	0.36
Coexisting acute pyelonephritis	1.99	0.36–37.98	0.47
Urinary drainage	0.43	0.11–2.07	0.26
Stone size, mm	0.97	0.86–1.04	0.45
Multiple stones	1.55	0.40–7.39	0.53
Stone removal	0.05	0.00–0.27	<0.01	0.06	0.00–0.43	<0.01