**5. Conclusion**

A log-rank test from the counting process formulation [37–39] established a significant difference between the hazard curves of the WPB-based good and poor trackers (p-value = 0.044). Similarly log-rank tests performed for a variety of violation numbers to test for differences between good and poor trackers times to their 5th, 10th, 15th, 20th, 25th and 30th violation, showed evidence of a significant difference

between good and poor trackers for a selection of these violation times (namely patient's time to their 10th, 15th and 25th violation). In regard to analysing the patients time to their last recorded violation, log-rank tests and Kaplan–Meier curves showed that poor trackers tend to have a higher probability of still violating as time progresses in ICU compared to good trackers (p-value = 0.045).
