308 Chapter 12 Fig. 1C). Frequently, the software was not able to follow the selected pixels correctly, which was then manually corrected by the researcher by moving the tracking point back to the originally selected point on the instrument. The instrument tracking was manually interrupted if there was something covering it, such as tissue, blood or another instrument. It was also stopped if the instrument was out of view of the camera or if the camera was in movement. If a pelvic lymph node dissection was performed, the instrument was not tracked during this part of the surgery, since not all videos contained a pelvic lymph node dissection. Patient selection and matching Patients were selected based on their preoperative and post-operative continence as defined based on the International Consultation Incontinence Modular Questionnaire -Short Form (ICIQ-SF score). The ICIQ-SF is a Patient-reported outcome measures (PROMS) questionnaire which registers the patient’s urinary incontinence on three domains, the frequency of urine leakage (0-5 points), the amount of leakage according to the patient (0-6 points), and the interference of the urine leakage with everyday life (0-10 points). An additional question which asks in which situation the urine leaks gives more insight into the type of incontinence. The cumulative scores of the three question (0-21 points) represent the patients experience of urinary incontinence. In this study an ICIQ-SF score of 0 at 6 and 12 months postoperative was defined as continent, whilst and ICIQ-SF of >10 at 6 and 12 months postoperative was defined as incontinent. Two groups of patients were selected. The first group (A) consisted of patients who were continent preoperative and were continent at 6 and 12 months after surgery this group was matched with a second group (B) of patients who were continent preoperative and were incontinent at 6 and 12 months after surgery. The patients in the continency group were matched according to the date of the surgery, the age of the patient, BMI of the patient and the preoperative intentions of saving the neurovascular bundles during surgery. All incontinent patients were manually compared to the continent patients by two individual researchers (AB and HN). Based on the number of variables in which the pairs matched a matching score of zero to four was given to the patients, each matched variable resulted in a point in the total matching score. The patients were matched based on age (difference of < 5 years = 1 matching point), BMI (difference < 3 points = 1 matching point), date of the surgery (difference <3 months = 1 matching point), and preoperative intentions of saving the neurovascular bundles during surgery on both sides (NVB sparing the same in both patients = 1 matching point). A matching score of four was the best possible match. Based on the matching scores the best matched patient pairs were selected for analysis, since almost no perfect matches existed (Appendix 1). If matched
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