233 Identifying surgical factors predicting postoperative urinary continence in robot-assisted radical prostatectomy Method Subject selection Patients who underwent a robot assisted radical prostatectomy in the Antoni van Leeuwenhoek Hospital in Amsterdam between June 2009 and February 2017, the Netherlands, were eligible for this study. All of the selected patients were operated by the same expert robotic surgeon (HvdP), who had performed over 200 RARP’s using the daVinci Si surgical robot by Intuitive in June 2009 and over 1400 RARP’s in February 2017. An initial selection was made based on available Patient-reported outcome measures (PROMS) records of the patients. In 227 patient’s complete PROMS data were available at 6 or 12 months postoperative. Two groups of patients (continency and incontinency) were selected and matched (figure 1). Figure 1 study design Power analysis Since this is a pilot study a power analysis was performed based: on the measures from one of the methods (GEARS) used during this study. The sample size analysis was based on a publication of Volpe et al.18 in this study both experts and fellows were observed during a RARP using the GEARS score in order to determine their ability to perform a RARP. The results show a significant higher score for the experts compared to the fellows.
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