Figure 1. Learning curve of robot-assisted surgery for treating early-stage cervical cancer. The x-axis indicates the number of procedures performed. The y-axis indicates the cumulative sum of success and failure of the surgical team in terms of recurrence, adjusted for the probabilities from the risk model. The RA-CUSUM+ (orange) is designed to detect decrease in surgical performance while RA-CUSUM- (blue) is designed to detect increase in the surgical performance. Both curves move upward for surgical failure and downward for surgical success.
Figure 2. One-way ANOVA of operation time (start of incision until end of closure) per group
Figure 3. Survival curves: 5-year DFS (A), 5-year DSS (B), 5-year OS (C).