Skip to main content

Table 3 Quality of chest compression with adjusted group effects

From: Smartphone apps to support laypersons in bystander CPR are of ambivalent benefit: a controlled trial using medical simulation

  Control
group
Facultative group Mandatory group Control vs. facultative group
β [95 %CI]; p
Control vs. mandatory group
β [95 %CI]; p
Correct compression rate [100–120/min− 1] (%)     β=-4.59 [-16.91; 7.73]; p = .47 β = 18.61 [6.10; 31.11]; p = .004
mean (standard deviation) 43.8 (±36.8) 39.2 (±34.8) 65.4 (±32.7)   
median (lower; upper quartile) 42 (6; 81) 32 (6.3; 74.8) 81 (44.3; 89)   
Correct compression depth [5-6 cm] (%)     β = 11.20 [-0.57; 22.98]; p = .06 β = 22.91 [10.97; 34.86]; p < .001
mean (standard deviation) 24.4 (±30.4) 30.1 (±35.2) 47.6 (±37.3)   
median (lower; upper quartile) 10 (0.5; 36.5) 7.5 (0; 59.5) 51.5 (9.3; 82.5)   
Correct release of compression (%)     β=-10.46 [-19.72; -1.20] ; p = .027 β = 1.34 [-7.99; 10.66]; p = .78
mean (standard deviation) 89.7 (±22.6) 81.7 (±30.9) 87.8 (±23.8)   
median (lower; upper quartile) 100 (94.6; 100) 98 (77.5; 100) 100 (89.3; 100)   
Correct hand position (%)     β=-1.29 [-10.64; 8.06]; p = .79 β = 6.13 [-3.28; 15.54]; p = .20
mean (standard deviation) 76.8 (±28.3) 77.6 (±30.9) 86.4 (±19.0)   
median (lower; upper quartile) 90 (64.3; 99) 95 (59.3; 99) 97 (79.3; 100)