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Table 2 Required sample size according to the number of EMS stations

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
  1. EMS emergency medical services