Table 3 Quality of chest compression with adjusted group effects

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)