Table 1.

Comparison of patients’ demographics between the 2 groups.

Characteristics	SG (n = 92)	DG (n = 28)	t/x2	P value when applicable
Gender (n, %)	49 (53.26)	13 (46.43)	0.634	.526
Age (years) (mean ± SD)	61.79 ± 5.54	63.80 ± 6.03	1.647	.102
diabetes (n, %)	12 (13.04)	11 (39.29)	14.510	.000
Urinary tract obstruction (n, %)	19 (20.65)	15 (53.57)	11.460	.000
After PCNL (n, %)	29 (31.52)	3 (10.71)	4.753	.029
After URL (n, %)	32 (34.78)	2 (7.14)	8.076	.004

DG = the death group, PCNL = percutaneous nephroscope, SG = the survival group, URL = ureteroscopy.