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Table 1 Rate and depth of chest compressions (mean ± SE)

From: A randomized cross-over study of the quality of cardiopulmonary resuscitation among females performing 30:2 and hands-only cardiopulmonary resuscitation

  Hands-Only CPR 30:2 CPR
Measures Early End Across time Early End Across time
Compression rate (number per minute)* 90.4 ± 1.2 92 ± 3.5 91.2 ± 2.3 96.8 ± 0.5 98.9 ± 5.7 97.9 ± 3.5
Compression depth (mm)* 42.1 ± 2.7 36.3 ± 3.0 39.2 ± 4.1 43.7 ± 0.9 40.3 ± 2.5 42.0 ± 2.5
Percent of compressions 38 mm or more* 73.2 ± 10.5 46.6 ± 16.8 59.9 ± 19.1 82.3 ± 2.6 62.8 ± 16.4 72.5 ± 14.8
Hands-Only CPR and 30:2 CPR
  Early End All Subjects (across time and CPR type)
Compression rate (number per minute) 93.7 ± 0.8   95.5 ± 4.7 94.6 ± 1.8
Compression depth (mm)* 42.9 ± 1.8   38.3 ± 2.8 40.7 ± 2.3
Percent compressions 38 mm or more* 77.8 ± 4.0   54.7 ± 16.6 66.2 ± 10.4