Table 1

Basic characteristics of patients in this study

VariablesTraining cohortValidation cohortP value
Number of patients, n (%)1803 (70)773 (30)
Age, median (IQR)71.00 (64.00–78.00)71.00 (63.00–78.00)0.710
Sex, n (%)0.150
 Female711 (39.4)329 (42.6)
 Male1092 (60.6)444 (57.4)
Race, n (%)0.045
 Black80 (4.4)50 (6.5)
 Other169 (9.4)83 (10.7)
 White1554 (86.2)640 (82.8)
Marital status, n (%)0.656
 Married1565 (86.8)677 (87.6)
 Others67 (3.7)31 (4.0)
 Single171 (9.5)65 (8.4)
Year, n (%)0.813
 2004–2006346 (19.2)159 (20.6)
 2007–2009439 (24.3)181 (23.4)
 2010–2012479 (26.6)198 (25.6)
 2013–2015539 (29.9)235 (30.4)
Site, n (%)0.609
 Renal pelvis1152 (63.9)485 (62.7)
 Ureter651 (36.1)288 (37.3)
Grade, n (%)0.481
 Grade I47 (2.6)16 (2.1)
 Grade II149 (8.3)69 (8.9)
 Grade III559 (31.0)258 (33.4)
 Grade IV1048 (58.1)430 (55.6)
Size, n (%)0.188
 2–4559 (31.0)268 (34.7)
 <2262 (14.5)106 (13.7)
 ≥4982 (54.5)399 (51.6)
Laterality, n (%)0.551
 Left995 (55.2)416 (53.8)
 Right808 (44.8)357 (46.2)
Surgery, n (%)0.203
 No/unknown9 (0.5)8 (1.0)
 Yes1794 (99.5)765 (99.0)
Radiotherapy, n (%)0.931
 No/unknown1676 (93.0)720 (93.1)
 Yes127 (7.0)53 (6.9)
Chemotherapy, n (%)0.938
 No/unknown1243 (68.9)531 (68.7)
 Yes560 (31.1)242 (31.3)
Distant metastasis, n (%)0.053
 M01652 (91.6)689 (89.1)
 M1151 (8.4)84 (10.9)
LNE, median (IQR)3.00 (1.00–7.00)3.00 (1.00–7.00)0.627
LNP, median (IQR)0.00 (0.00–1.00)0.00 (0.00–1.00)0.542
LNR, median (IQR)0.00 (0.00–0.50)0.00 (0.00–0.33)0.546
  • LNE, lymph nodes examined; LNP, lymph nodes positive; LNR, lymph nodes ratio.