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Table 1 Basic oncological and surgical characteristics of the study population (per protocol analysis)

From: Bladder perforation during transurethral resection of bladder tumour is not a result of a deficient structure of the bladder wall

  Group 1 (perforation) Group 2 (no perforation) P value (group 1 vs. group 2) Total
Number of patients 11 13 n.a. 24
 Men 7 6   11
 Women 4 7 0.39 * 13
Mean age of patients (years) 74.8 72.3 0.32 ** 73.5
% of recurrent tumours 45.5 38.5 0.73 * 41.7
Mean recurrence rate (for recurrent tumours) 0.58/year 1.18/year 0.17 *** 0.92/year
Mean tumour diameter (centimetres) 2.25 1.68 0.45 *** 1.94
% of operations performed by residents in training 45.5 53.8 0.22 * 50.0
Stage of bladder cancer Ta 8 13 0.13 * 21
Tis 0 0 0
T1 2 0 2
≥ T2 1 0 1
Cancer grade Low grade 6 11 0.11 * 17
High grade 5 2 7
  1. Stage of bladder cancer (according to TNM classification)
  2. Ta non-invasive papillary carcinoma, Tis carcinoma in situ, T1 tumour invades subepithelial connective tissue, T2 tumour invades the muscle
  3. *Pearson’s chi-square test
  4. **unpaired t test
  5. ***Mann-Whitney U test