Statistical analysis
All statistical tests were selected before data collection. Statistical analyses were performed using Microsoft Excel (version 15.29, Microsoft Corporation, Redmond, WA, USA) and Prism (version 8, GraphPad Software, La Jolla, CA, USA). The significance level was set to p < 0.05. The assumption of normality was tested graphically using quantile-quantile plots. If not otherwise specified, data are presented as mean with standard deviation (SD) or absolute numbers with percentages. A paired sample Student’s t-test was performed to compare pre- and postoperative means in AC and BC PTA as well as ZCMEI-21 total scores. For comparison of >2 groups, a one-way ANOVA was performed. Following one-way ANOVA, the Holm-Sidak test was used to compare pairs of means. If applicable, p-values represent p-values corrected for multiple testing.