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Table 3 Performance variables for chest compressions performed without feedback

From: Effect of feedback on delaying deterioration in quality of compressions during 2 minutes of continuous chest compressions: a randomized manikin study investigating performance with and without feedback

Variable 0 to 29.9 s 30 s to 59.9 s 60 s to 89.9 s 90 s to 120 s
Compressions above target (%) 73.2 (0.00-95.6) 53.4 (0.00-100) 23.5 (0.00-100) 29.6 (0.00-99.5)
Compressions within target (%) 19.6 (2.26-60.2) 33.1 (0.00-81.9) 44.5 (0.00-74.7) 32.7 (0.00-83.6)
Compressions below target (%) 0.90 (0.00-3.76) 0.00 (0.00-0.00) 0.00 (0.00-26.9) 0.00 (0.00-6.35)
Mean compression depth (cm) 5.94 SD 0.77 5.92 SD 0.77 5.87 SD 0.77 5.88 SD 0.77
Rate above target (%) 0.00 (0.00-39.9) 0.0 (0.00-33.3) 0.00 (0.00-13.1) 0.00 (0.00-9.33)
Rate within target (%) 61.0 (26.4-95.9) 58.0 (4.98-100) 48.5 (5.24-100) 47.4 (5.95-99.6)
Rate below target (%) 1.85 (1.72-36.8) 0.00 (0.00-49.8) 0.00 (0.00-67.6) 0.84 (0.00-68.4)
Mean compression rate (min-1) 108.8 SD 10.7 108.6 SD 12.1 107.6 SD 12.0 107.1 SD 12.2
  1. values are depicted as medians with interquartile range in parenthesis. Mean depth and rate as means with standard deviation (SD). *p < 0.05 compared to the first (0-29.9 s) interval