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

1

≤1(Group 1)/≥2(Group 2)

(35.74%)

(27.93%)

<0.0001

2

≤2(Group 1)/≥3(Group 2)

(34.48%)

(24.75%)

<0.0001

3

≤3(Group 1)/≥4(Group 2)

(33.15%)

(22.11%)

<0.0001

4

≤4(Group 1)/≥5(Group 2)

(32.48%)

(19.06%)

<0.0001

5

≤5(Group 1)/≥6(Group 2)

(31.86%)

(18.29%)

<0.0001

6

≤6(Group 1)/≥7(Group 2)

(31.48%)

(17.49%)

<0.0001

7

≤7(Group 1) ≥8(Group 2)

(31.34%)

(15.71%)

<0.0001

8

≤8(Group 1)/≥9(Group 2)

(31.25%)

(13.13%)

<0.0001

9

≤9(Group 1)/≥10(Group 2)

(31.18%)

(13.11%)

<0.0001