21. A medical device, comprising: a sensor configured to sense one or more patient parameters used to sense field data about a patient, the field data derived from a Cardio Pulmonary Resuscitation (CPR) session and including events occurring to the patient over time, the events including at least one of chest compressions and ventilations within the CPR session; a processor; a non-transitory memory configured to store one or more programs which, when executed cause the medical device to: generate annotations from the field data, the annotations identifying one or more events within the field data, obtain at least one accuracy criterion indicating an expected order of an event sequence, compute at least one accuracy score for the annotations based on the accuracy criterion, and assign, out of a plurality of possible grades, at least one grade based on the accuracy score, the assigned grade indicating an accuracy with which the annotations identify the events; and a transmitter for transmitting a wireless output signal that includes the at least one grade for the annotations.
22. The medical device of claim 21 , in which the execution of the one or more programs further cause the medical device to: compare the at least one grade to a threshold, adjust at least one parameter used to generate at least one of the annotations when the grade does not meet the threshold, generate adjusted annotations based on the adjusted parameter, and assign at least one adjusted grade to the adjusted annotations for inclusion in the wireless output signal.