Table 1 Descriptive statistics of development cohort and external validation cohort

From: External validation of an online nomogram in patients undergoing radical nephroureterectomy for upper urinary tract urothelial carcinoma

  Nomogram development cohort External validation cohort
Variable No. of patients % No. of patients %
No. of patients 397 100 328 100
Age, years
Mean 68   63.1  
Range 26–100   24.5–90.0  
Sex
Male 255 64.2 261 79.6
Female 142 35.8 67 20.4
Tumour location
Renal pelvis 229 57.7 165 50.3
Ureteral 105 26.4 118 36.0
Both synchronously 63 15.9 44 13.4
Bladder cuff removal 258 65 267 81.4
Lymph node dissection
Yes 160 40.3 55 16.8
Pathological T category
pTa/cis 0 0 49 14.9
pT1 212 53.4 77 23.5
pT2 36 9 56 17.1
pT3 126 31.7 137 41.8
pT4 23 5.9 9 2.7
Pathological N category
pN0 122 30.7 40 12.2
pN1-3 38 9.6 15 4.5
pNx 237 59.7 273 83.2
Tumour grade
I 30 7.5 16 4.9
II 155 39 215 65.5
III 212 53.5 97 29.6
Associated CIS 16 4 23 3.6
Positive surgical margin 27 6.8 16 4.9
Follow-up, months
Mean 33.6   74.8  
Range 0–225   0.1–242.7  
  1. Abbreviation: CIS=carcinoma in situ.