Table 3. Multivariate Cox regression analyses of risk factors for postoperative stage 3B CKD (eGFR < 45 mL/min/1.73 m²).

Incontinent urinary diversion was divided into 2 groups, and compared with orthotopic ileal neobladder in the model 2. Comorbidities included past history of CVD, HTN, or DM.

Variables (Model 1)	Fisk factors	P value	HR	95%CI
Age	Older than 67 years	0.043	2.90	1.03–8.13
Comorbidities	Pre-existing	0.110	2.40	0.82–7.02
eGFR before surgery	< 60 ml/min/1.73m2	0.020	3.25	1.20–8.80
Stent indwelling	Positive	0.163	0.40	0.11–1.45
Postoperative hydronephrosis	Greater than grade 1	0.002	5.15	1.81–14.6
Tumor recurrence	Positive	0.900	0.91	0.22–3.71
Chemotherapy for recurrent disease	Positive	0.290	0.43	0.09–2.04
Urinary diversion	Incontinent diversion	0.016	4.41	1.33–14.7
Variables (Model 2)
Age	Older than 67 years	0.025	3.47	1.17–10.4
Comorbidities	Pre-existing	0.129	2.32	0.78–6.87
eGFR before surgery	< 60 ml/min/1.73m2	0.016	3.32	1.25–8.82
Stent indwelling	Positive	0.065	0.22	0.04–1.10
Postoperative hydronephrosis	Greater than grade 1	0.003	4.81	1.70–13.7
Tumor recurrence	Positive	0.969	0.97	0.23–4.11
Chemotherapy for recurrent disease	Positive	0.196	0.33	0.06–1.77
Urinary diversion (ref. neobladder)	Cutaneous ureterostomy	0.012	8.92	1.63–48.7
	Ileal conduit	0.069	3.44	0.91–13.1