CPR technique mean value | CPR technique median value | Difference* | P values† | ||||

TT | TF | TT | TF | Mean | Median | ||

Technique measures | |||||||

Compression depth (mm) | 39.8 | 37.8 | 40.0 | 38.0 | 2.0 | 2.0 | <0.01 |

Mean rate (compressions per minute) | 114.1 | 116.1 | 114.0 | 117.5 | −2.0 | −3.5 | 0.31 |

Deep enough compressions (%) | 52.2 | 51.2 | 55.5 | 46.5 | 1.4‡ | 9.0 | 0.78‡ |

Compressions with adequate rate (%) | 59.6 | 57.5 | 68.0 | 57.0 | 3.7‡ | 11.0 | 0.45‡ |

Compression fraction (%) | 69.6 | 73.3 | 72.0 | 74.0 | −3.7 | −2.0 | 0.03§ |

Correct hand position (%) | 82.8 | 85.1 | 96.0 | 93.5 | −2.3 | 2.5 | 0.39§ |

Correctly released compression (%) | 53.2 | 74.8 | 47.5 | 88.0 | −21.6 | −40.5 | <0.01 |

Average hands-off time (s) | 30.2 | 27.8 | 28.8 | 28.8 | 2.4 | 0.0 | 0.30§ |

No flow time (s) | 130.7 | 128.1 | 129.6 | 124.8 | 2.6 | 4.8 | 0.70§ |

Self-reported measures | |||||||

Tiredness score | 3.7 | 3.9 | 3.0 | 3.5 | −0.2 | −0.5 | 0.98 |

Pain score | 4.9 | 5.8 | 4.0 | 6.0 | −0.9 | −2.0 | 0.07 |

*Matched measure of effect.

†Two-sided Wald test p value, unless specified.

‡Adjusting for ordering of training, due to change in estimates greater than 20%.

§Rank-based p value, due to violation of regression assumptions.

CPR, cardiopulmonary resuscitation; TF, two-finger; TT, two-thumb.