Table II.

Clinical characteristics of UU and univariate analysis of variables associated with failure of stent insertion in 202 UUs.

Variable	Success	Failure	P-value	OR	95% CI
Mean age, years	50.48	48.20	0.133	0.978	0.950–1.007
Mean SCr, µmol/l	90.83	93.66	0.648	0.999	0.994–1.004
Gender, n (%)			0.380	0.688	0.297–1.591
Male	15 (57.7)	11 (42.3)
Female	117 (66.5)	59 (33.5)
ECOG, n (%)			0.001	5.042	2.272–11.190
≤1	121 (71.6)	48 (28.4)
2–3	11 (33.3)	22 (66.7)
Hydronephrosis degree, n (%)			<0.001	5.733	3.521–9.334
≤10	19 (95.0)	1 (5.0)
≤20	76 (87.4)	11 (12.6)
≤30	32 (58.2)	23 (41.8)
≤40	5 (15.6)	27 (84.4)
>40	0 (0.0)	8 (100.0)
Bladder invasion, n (%)			0.005	14.556	1.753–120.868
No	131 (67.5)	63 (32.5)
Yes	1 (12.5)	7 (87.5)
Cause of hydronephrosis, n (%)			0.006	3.695	1.383–9.871
Tumor compression	125 (68.3)	58 (31.7)
Invasion of the ureter	7 (36.8)	12 (63.2)
Prior radiotherapy, n (%)			0.004	2.403	11.325–4.357
No	90 (73.2)	33 (26.8)
Yes	42 (53.2)	37 (46.8)
Obstruction level, n (%)			0.253	1.414	0.782–2.545
Proximal ureter	62 (69.7)	27 (30.3)
Distal ureter	70 (61.9)	43 (38.1)
Primary disease, n (%)			0.233	–	–
Cervical	74 (61.2)	47 (38.8)
Ovarian	22 (84.6)	4 (15.4)
Gastric	11 (61.1)	7 (38.9)
Rectal	10 (71.4)	4 (28.6)
Other	15 (65.2)	8 (34.8)
Side of stenting, n (%)			0.014	0.477	0.263–0.866
Left	41 (54.7)	34 (45.3)
Right	91 (71.7)	36 (28.3)
Laterality, n (%)			0.103	0.600	0.324–1.112
Unilateral	77 (61.1)	49 (38.9)
Bilateral	55 (72.4)	21 (27.6)

UU, ureteral units; OR, odds ratio; CI, confidence interval; SCr, serum creatinine.