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Table 3 Results of signal detection analysis concerning the association between the time (min.) from the call to arrival at the hospital 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 ≤4(Group 1)/≥5(Group 2) 0 (0.00%) 6480 (31.08%) 0.45 0.5019
2 ≤5(Group 1)/≥6(Group 2) 0 (0.00%) 6480 (31.08%) 0.90 0.3423
3 ≤6(Group 1)/≥7(Group 2) 1 (25.00%) 6479 (31.08%) 0.07 0.7928
4 ≤7(Group 1)/≥8(Group 2) 6 (60.00%) 6474 (31.06%) 3.91 0.0481
5 ≤8(Group 1)/≥9(Group 2) 10 (66.67%) 6470 (31.05%) 8.88 0.0029
6 ≤9(Group 1)/≥10(Group 2) 18 (54.55%) 6462 (31.04%) 8.50 0.0036
7 ≤10(Group 1) ≥11(Group 2) 26 (56.52%) 6454 (31.02%) 13.93 0.0002
8 ≤11(Group 1)/≥12(Group 2) 38 (52.05%) 6442 (31.00%) 15.05 <0.0001
9 ≤12(Group 1)/≥13(Group 2) 58 (47.54%) 6422 (30.98%) 15.53 <0.0001
10 ≤13(Group 1)/≥14(Group 2) 85 (50.00%) 6395 (30.92%) 28.65 <0.0001
11 ≤14(Group 1)/≥15(Group 2) 142 (50.71%) 6338 (30.81%) 51.09 <0.0001
12 ≤15(Group 1) ≥16(Group 2) 220 (50.00%) 6260 (30.67%) 75.14 <0.0001
13 ≤16(Group 1)/≥17(Group 2) 336 (50.15%) 6144 (30.44%) 117.55 <0.0001
14 ≤17(Group 1)/≥18(Group 2) 453 (46.85%) 6027 (30.31%) 117.71 <0.0001
15 ≤18(Group 1)/≥19(Group 2) 614 (45.92%) 5866 (30.06%) 147.00 <0.0001
16 ≤19(Group 1)/≥20(Group 2) 800 (44.57%) 5680 (29.81%) 166.88 <0.0001
17 ≤20(Group 1) ≥21(Group 2) 966 (43.83%) 5514 (29.57%) 187.09 <0.0001
18 ≤21(Group 1)/≥22(Group 2) 1234 (43.54%) 5246 (29.12%) 237.92 <0.0001
19 ≤22(Group 1)/≥23(Group 2) 1469 (42.25%) 5011 (28.84%) 243.13 <0.0001
20 ≤23(Group 1)/≥24(Group 2) 1693 (40.23%) 4787 (28.76%) 206.30 <0.0001
21 ≤24(Group 1)/≥25(Group 2) 1985 (39.80%) 4495 (28.34%) 232.64 <0.0001
22 ≤25(Group 1) ≥26(Group 2) 2269 (39.15%) 4211 (27.97%) 244.07 <0.0001
23 ≤26(Group 1)/≥27(Group 2) 2601 (38.87%) 3879 (27.39%) 279.53 <0.0001
24 ≤27(Group 1)/≥28(Group 2) 2863 (37.78%) 3617 (27.25%) 249.38 <0.0001
25 ≤28(Group 1)/≥29(Group 2) 3164 (37.11%) 3316 (26.91%) 244.74 <0.0001
26 ≤29(Group 1)/≥30(Group 2) 3446 (36.69%) 3034 (26.47%) 251.69 <0.0001
27 ≤30(Group 1) ≥31(Group 2) 3683 (36.14%) 2797 (26.24%) 238.47 <0.0001
28 ≤31(Group 1)/≥32(Group 2) 3929 (35.52%) 2551 (26.06%) 216.89 <0.0001
29 ≤32(Group 1)/≥33(Group 2) 4178 (35.16%) 2302 (25.67%) 215.18 <0.0001
30 ≤33(Group 1)/≥34(Group 2) 4380 (34.63%) 2100 (25.60%) 189.41 <0.0001
31 ≤34(Group 1)/≥35(Group 2) 4545 (34.33%) 1935 (25.42%) 179.13 <0.0001
32 ≤35(Group 1) ≥36(Group 2) 4714 (33.91%) 1766 (25.41%) 156.33 <0.0001
33 ≤36(Group 1)/≥37(Group 2) 4865 (33.56%) 1615 (25.41%) 137.16 <0.0001
34 ≤37(Group 1)/≥38(Group 2) 4998 (33.23%) 1482 (25.51%) 116.66 <0.0001
35 ≤38(Group 1)/≥39(Group 2) 5145 (32.94%) 1335 (25.53%) 100.46 <0.0001
36 ≤39(Group 1)/≥40(Group 2) 5262 (32.64%) 1218 (25.75%) 81.05 <0.0001
37 ≤40(Group 1) ≥41(Group 2) 5356 (32.37%) 1124 (26.12%) 62.18 <0.0001
38 ≤41(Group 1)/≥42(Group 2) 5437 (32.16%) 1043 (26.43%) 49.20 <0.0001
39 ≤42(Group 1)/≥43(Group 2) 5507 (31.91%) 973 (27.07%) 32.51 <0.0001
40 ≤43(Group 1)/≥44(Group 2) 5583 (31.74%) 897 (27.52%) 22.78 <0.0001
41 ≤44(Group 1)/≥45(Group 2) 5637 (31.60%) 843 (27.96%) 15.99 <0.0001
42 ≤45(Group 1) ≥46(Group 2) 5703 (31.44%) 777 (28.67%) 8.42 0.0037
43 ≤46(Group 1)/≥47(Group 2) 5766 (31.38%) 714 (28.83%) 6.66 0.0099
44 ≤47(Group 1)/≥48(Group 2) 5810 (31.25%) 670 (29.63%) 2.47 0.1159
45 ≤48(Group 1)/≥49(Group 2) 5856 (31.22%) 624 (29.84%) 1.66 0.1981
46 ≤49(Group 1)/≥50(Group 2) 5900 (31.15%) 580 (30.32%) 0.57 0.4518
47 ≤50(Group 1)/≥51(Group 2) 5949 (31.15%) 531 (30.33%) 0.50 0.4774
  1. Patients were divided into two groups: ≤ 26 minutes (group 1) and ≥ 27 minutes (group 2) based on the time elapsed from the call until arrival at the hospital, determined by the largest Chi-squared value.