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Table 1 Comparison of the control and intervention groups at the beginning of the study

From: Are two or four hands needed for elderly female bystanders to achieve the required chest compression depth during dispatcher-assisted CPR: a randomized controlled trial

Variable All control group All intervention group p Female control group Female intervention group p Male control group Male intervention group p
(N-32) (N-34) (N-26) (N-22) (N-6) (N-12)
Mean age, years 59.6(6.9) 60.6(6.9) 0.565 60.4(7) 61.7(0.2) 0.511 56.6(6.3) 58.6(7.7) 0.565
Weight, kg 79.0(16.5) 81.1(15.2) 0.562 78(17.7) 75.09(12.07) 0.519 84.8(5.1) 92.1(14.4) 0.299
Height, m 1.68(0.07) 1.69(0.1) 0.603 1.66(5.5) 1.64(5.96) 0.141 1.77(0.07) 1.79(0.08) 0.649
BMI 28.0(5.9) 28.3(4.4) 0.832 28.2(6.43) 28.0(4.67) 0.914 27.1(2.1) 28.7(4.1) 0.384
Clinical frailty score          
No 1–2 (%) 27(79.4) 24(70.6) 0.401a 23(85.2) 14(63.6) 0.157a 4(57.1) 10(83.3) 0.211a
No 3 (%) 7(20.6) 10(29.4)   4(14.8) 8(36.4)   3(42.9) 2(16.7)  
Heart rate, min−1 77.5(10.6) 79.6(11.7) 0.443 76.4(10.54) 80.2(12.10) 0.245 81.9(10.6) 78.5(11.2) 0.531
MAP, mm Hg 96.2(13.1) 91.8(11.5) 0.144 93.1(10.96) 88.4(11.00) 0.146 108.0(14.8) 97.8(10.1) 0.092
Saturation, % 97.2(1.8) 96.7(1.8) 0.636 97.3(1.88) 97.3(1.80) 0.965 96.7(1.5) 96.4(1.6) 0.697
  1. Data are presented as the mean (SD)
  2. aChi square = 2.00, df =1