Statistical analysis
Information from the database was analysed in a de-identified manner
using the REDcap data base system as well as SPSS (v25.0. Armonk, NY:
IBM Corp). Variables were summarized as mean and SD, median and
interquartile range (IQR) or count and percentage. Incontinence scores
are presented as mean values. Paired nonparametric data were analysed
using Wilcoxon signed rank sum test and independent categorical data
will be analysed with the chi-squared test. In addition, scores of 0 or
1 on The St Marks Questionnaire with regard to solid, liquid, or flatal
incontinence were analysed as “no incontinence” respectively, and
pre-op and long-term follow-up for these variables were compared using
McNemar’s test. Values of P < 0.05 were considered
statistically significant.