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Table 2 Results of signal detection analysis concerning the association between the number of defibrillation shocks and 1-month survival among patients with out-of-hospital cardiac arrest presenting with ventricular fibrillation

From: The number of prehospital defibrillation shocks and 1-month survival in patients with out-of-hospital cardiac arrest

   Number and 1-month survival rate (%) χ 2 value P value
   Group 1 Group 2   
1 ≤1(Group 1)/≥2(Group 2) 3003 (35.74%) 3477 (27.93%) 142.68 <0.0001
2 2(Group 1)/3(Group 2) 4677 (34.48%) 1803 (24.75%) 209.61 <0.0001
3 ≤3(Group 1)/≥4(Group 2) 5616 (33.15%) 864 (22.11%) 180.63 <0.0001
4 ≤4(Group 1)/≥5(Group 2) 6065 (32.48%) 415 (19.06%) 163.82 <0.0001
5 ≤5(Group 1)/≥6(Group 2) 6260 (31.86%) 220 (18.29%) 97.50 <0.0001
6 ≤6(Group 1)/≥7(Group 2) 6374 (31.48%) 106 (17.49%) 53.78 <0.0001
7 ≤7(Group 1) ≥8(Group 2) 6425 (31.34%) 55 (15.71%) 39.23 <0.0001
8 ≤8(Group 1)/≥9(Group 2) 6454 (31.25%) 26 (13.13%) 30.06 <0.0001
9 ≤9(Group 1)/≥10(Group 2) 6464 (31.18%) 16 (13.11%) 18.49 <0.0001
  1. The patients were divided into ≤ 2 shocks (Group 1) and ≥ 3 shocks groups (Group 2) based on the number of defibrillation shocks, determined by the largest Chi-squared value.