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Table 4 Intra- and inter-group comparisons from the first vs. second halves of the study period

From: Real-time compression feedback for patients with in-hospital cardiac arrest: a multi-center randomized controlled clinical trial

Groups ICU survival Return of spontaneous circulation
Frequency (%) Frequency (%)
Alive Death Yes No
Cardio First Angel™ 1st half 126 (56) 99 (44) 144 (64) 81 (36)
Cardio First Angel™ 2nd half 143 (63.6) 82 (36.4) 156 (69.3) 69 (30.7)
Control 1st half 90 (40) 135 (60) 116 (51.6) 109 (48.4)
Control 2nd half 61 (27.1) 164 (72.9) 75 (33.3) 150 (66.7)
Significance level P < 0.0001a P < 0.0001a
P = 0.103b P = 0.231b
P = 0.001c P = 0.008c
P < 0.0001d P < 0.0001d
P < 0.0001e P < 0.0001e
P < 0.0001f P < 0.0001f
P = 0.004g P < 0.0001g
  1. aChi-square test comparing the variables in all groups
  2. bChi-square test comparing intra-group comparison of Cardio First Angel™ 1st vs. 2nd half
  3. cChi-square test comparing inter-group comparison for 1st half of study
  4. dChi-square test for inter-group comparison for Cardio First Angel™ 1st half to control 2nd half
  5. eChi-square test for inter-group comparison for Cardio First Angel™ 2nd half to control 1st half
  6. fChi-square test comparing inter-group comparison for 2nd half of study
  7. gChi-square test comparing intra-group comparison of controls 1st vs. 2nd half