Figure 1

Flowchart showing the distribution of participants. * Given basic life support course before randomisation; ** Due to daily activities, like dispatch to fire- and rescue-operations, during the test period; *** Due to organisation and daily activities, participants could not be identified for each roster until the test date; Randomisation was performed each day; **** Excluded from analysis for various reasons (data loss due to malfunction of manikin, misunderstanding instructions, and post-participation discovery of not fulfilling inclusion criteria. A - B: Standard CPR followed by intervention CPR. B - A: Intervention CPR followed by standard CPR.