Table 1

Quality measures and indices for two-thumb (TT) and two-finger (TF) technique chest compressions

TT technique (n=22)TF technique (n=22)Mean paired difference (TT less TF)p Value
Compression depth (CD)
 Mean compression depth (mm)33±326±57 (5 to 10)<0.001
 CD quality index (≥36.7 mm) (%)6 (0, 7)0 (0, 0)<0.001
 Secondary CD quality index (≥40 mm) (%)0 (0, 0)0 (0, 0)1.00
Release force (RF)
 Mean release force (kg)0.8±0.40.2±0.20.6 (0.4 to 0.7)<0.001
 RF quality index (<2.5 kg) (%)100 (100, 100)100 (100, 100)0.32
 Secondary complete RF index (<0.5 kg) (%)10 (0, 71)100 (94, 100)<0.001
Compression rate (CR)
 Mean compression rate (cpm)128±21131±21−3 (−7 to 0)0.052
 CR quality index (100–120 cpm) (%)47 (3, 78)39 (2, 72)0.24
Compression duty cycle (DC)
 Mean compression duty cycle (%)61±853±89 (6 to 11)<0.001
 DC quality index (30–50%) (%)0 (0, 7)23 (4, 62)<0.001
Overall quality index (%)0 (0, 0)0 (0, 0)0.14
  • Values are given as mean±SD, except for the cardiopulmonary resuscitation (CPR) chest compression quality indices, which are given as the median value (IQR). Differences are given as the mean paired difference (95% CI). p Values are calculated using two-tailed paired sample Student t tests, except for the CPR chest compression quality indices, which are calculated using Wilcoxon's signed rank tests.

  • cpm, compressions per minute.