238 Chapter 9 Results In the continence group 191 of the 227 patients were eligible for inclusion. Based on selection criteria 79 patients were included in the continent subgroup, 10 patients in the incontinent subgroup. Matching and selection Based on the matching criteria for the continency group the 10 incontinent patients were manually matched with the 79 continent patients. Based on the power calculation 6 pairs were selected based on the date of the surgery, BMI, age, and preoperative intention of saving the neurovascular bundles during surgery on both sides (see appendix 1). A total of 12 individual patients were selected for analysis. Table 1: Baseline characteristics of the selected patients Characteristics Postoperative incontinent patients (n=6) Median (min - max) Postoperative continent patients (n=6) Median (min - max) P-value Z-Value Age (years) 64 (57 - 67) 62.5 (53 - 66) 0.674 -0.420 Body Mass Index (kg/ m2) 26.86 (20.45 – 32.55) 25.99 (22.50 – 32.11) 0.917 -0.105 Prostate size (ml) 50 (39 - 81) 38 (35 - 82) 0.225 -1.214 Gleason score 7 (6 - 8) 6 (6 - 7) 0.157 -1.414 Membranous urethral length (mm) 11.07 (8.69 – 13.10) 13.58 (10.48 – 16.15) 0.273 -1.095 Surgery date, median (IQR) 15-02-2014 (02-022013 – 15-03-2015) 27-04-2014 (06-12-2012 – 29-01-2015 0.600 -0.524 Preoperative IPSS score 3 (0 - 7) 2.5 (0 – 8.5) 0.892 -0.135 6 months postoperative IPSS score 15 (0 - 19) 3 (0 - 5) 0.042 -2.032 12 months postoperative IPSS score 10 (6 - 16) 2 (0 - 5) 0.043 -2.023 Preoperative ICIQ score 0 (0 - 0) 0 (0 - 0) 1.000 0.000 6 months ICIQ score 15 (11 - 20) 0 (0 - 0) 0.027 -2.207 12 months ICIQ score 14 (12 - 17) 0 (0 - 0) 0.026 -2.232 Baseline characteristics When comparing the 6 and 12 months postoperative IPSS scores, postoperative ICIQ scores, and postoperative EORTC QLQ-PR25 scores, the continent subgroup had significantly lower IPSS scores, ICIQ scores, and EORTC QLQ-PR25 scores than the incontinent subgroup (Table 1).
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