Table 2. Time-dependent cox proportional model for the overall mortality risk of deceased donor kidney transplantation.

Variable	Demographics	Hazard ratio	95% confidence interval	P value
Recipient Age (per a year)	46.4 ± 10.8	1.061	1.049–1.073	<0.001
Donor Age	43.4 ± 14.6	1.000	0.992–1.007	0.895
Gender (Female)	2202 (42%)	0.975	0.783–1.214	0.823
Waiting time (years)				<0.001
1st quartile (0~2.4)	1.22 ± 0.71	reference
2nd quartile (2.4~4.5)	3.53 ± 0.57	1.935	1.349–2.768	<0.001
3rd quartile (4.5~6.4)	5.42 ± 0.56	2.502	1.649–3.796	<0.001
4th quartile (6.4~)	8.13 ± 1.53	2.934	1.808–4.763	<0.001
Prior kidney transplant experience	1574 (6.5)	1.304	0.908–1.873	0.150
Rh blood type, negative	12 (0.2%)	2.952	0.943–9.235	0.063
ABO blood type				0.655
O type	1183 (22.5%)	reference
A type	1846 (35.1%)	1.048	0.784–1.399	0.752
B type	1455 (27.7%)	0.878	0.640–1.203	0.417
AB type	768 (14.6%)	0.995	0.694–1.428	0.980
Cause of ESRD				0.334
Diabetes	799 (15.2%)	reference
Hypertensive	782 (14.9%)	0.799	0.559–1.141	0.216
Chronic GN	980 (18.7%)	0.723	0.500–1.044	0.083
PKD	47 (0.9%)	<0.001	0.000–0.000	0.930
Others	1142 (21.7%)	0.713	0.509–0.999	0.049
Unknown	1502 (28.6%)	0.699	0.503–0.970	0.032

Abbreviations: ESRD, end stage renal disease; GN, glomerulonephritis; PKD, polycystic kidney disease