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Table 3 Components of compressions by training group

From: A randomized trial of video self-instruction in cardiopulmonary resuscitation for lay persons

  Overall (N = 439) Untrained (N = 135) Continuous compressions (N = 185) Compressions and ventilations (N = 119)
  Median (IQR) Median (IQR) Comparison to continuous compressions Median (IQR) Median (IQR) Comparison to continuous compressions
Proportion Correct Compressions 20.7 (0.3, 57.8) 11.3 (0.0, 51.3) Z = −2.20 p-value = 0.028 23.6 (1.0, 57.9) 30.8 (3.0, 61.6) Z = −0.91 p-value = 0.36
Average Compression Rate, no./min. 94.0 (72.0, 108.0) 85.0 (62.0, 102.8) Z = −1.32 p-value = 0.187 93.0 (65.0, 105.5) 104.0 (90.2, 113.0) Z = −5.14 p-value < 0.001
Compression Depth in mm 37.0 (26.0, 44.0) 36.0 (20.0, 44.0) Z = −0.48 p-value = 0.63 37.0 (27.0, 43.0) 38.5 (29.2, 45.0) Z = −1.70 p-value = 0.09
Proportion Compression Depth > 38 mm 51.3 (4.2, 93.6) 55.0 (0.6, 93.1) Z = −0.60 p-value = 0.55 55.7 (5.9, 89.1) 63.2 (12.9, 96.9) Z = −1.10 p-value = 0.27
Proportion with Correct Hand Placement 89.2 (58.8, 99.7) 77.3 (49.0, 97.2) Z = −3.52 p-value = <0.001 93.5 (62.3, 100.0) 91.8 (71.4, 99.7) Z = 0.19 p-value = 0.85