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Table 2 Performance variables for chest compressions performed with 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 (%) 20.4(0.00-92.4) 2.04(0.00-98.0) 2.00(0.00-100) 0.00(0.00-88.98)
Compressions within target (%) 54.0(5.06-82.9) 88.0(2.00-99.0) 72.6(0.00-99.0) 87.0(2.02-100)
Compressions below target (%) 3.92(0.85-13.2) 0.00(0.00-1.00)* 0.00(0.00-2.73)* 0.00(0.00-1.04)*
Mean compression depth (cm) 5.99 SD 0.85 6.00 SD 0.82 5.85 SD 0.78 5.79 SD 0.79
Rate above target (%) 0.00 (0.00-2.91) 0.00 (0.00-0.00) 0 .00 (0.00-0.00) 0.00 (0.00-0.00)
Rate within target (%) 64.0(38.8-82.4) 66.0(56.0-84.3) 62.0 (52.0-85.3) 62.5 (51.6-81.5)
Rate below target (%) 20.0 (2.90-47.0) 30.0 (2.78-40.0) 34.0 (2.77-41.0) 28.9 (0.91-43.8)
Mean compression rate (min-1) 102.6 SD 9.6 103.2 SD 9.4 102.7 SD 9.2 103.1 SD 9.7
  1. values are depicted as medians and interquartile range in parenthesis. Mean depth and rate as means with standard deviation (SD).*p < 0.05 compared to the first interval