From: Real-time feedback, debriefing, and retraining system of cardiopulmonary resuscitation for out-of-hospital cardiac arrests: a study protocol for a cluster parallel-group randomized controlled trial
Number of EMS stations
Number of patients enrolled per each EMS station (cluster size)
Total sample size
20
151
3020
30
97
2910
40
72
2880
50
57
2850