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Performance of chest compressions during the 8-minute conventional cardiopulmonary resuscitation (CPR) with mean compression depth (A), mean compression rate (B), the proportion of compressions with appropriate depth (C), and the proportion of students with mean compression depth greater than 50 mm (D). *P<0.05, #P<0.01 vs. CPR 2 minutes; ΔP<0.01 vs. CPR 4 minutes; ▲P<0.05, ▼P<0.01 vs. CPR 6 minutes.
