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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