Results
Participants overestimated achieving adequate chest compression depth (mean difference range: 16.1–60.6%) and rate (range: 0.2–51%), and underestimated chest compression fraction (0.2–2.9%) across all arms. Compared to no intervention, the use of real-time feedback and JIT CPR training (alone or in combination) improved perception of depth (p < 0.001). Accurate estimation of CPR quality was poor for chest compression depth (0–13%), rate (5–46%) and chest compression fraction (60–63%). Perception of depth is more accurate in CPR providers versus team leaders (27.8% vs. 7.4%; p = 0.043) when using real-time feedback.