Table 4 Logistic regression on the effect of survival to discharge showing odds ratio.

From: The interaction effect of bystander cardiopulmonary resuscitation (CPR) and dispatcher CPR on outcomes after out-of-hospital cardiac arrest

Variables

 

No survival discharge (N = 10,987)

Survival to discharge (N = 1430)

Model 1 (univariable)

Model 2 (multivariable)

Model 3 (multivariable with interaction)

Age

Mean ± SD

70.0 ± 15.0

58.7 ± 14.5

0.96 (0.95–0.96, p < .001)

0.97 (0.96–0.97, p < .001)

0.97 (0.96–0.97, p < .001)

Sex

Female

3969 (36.1%)

323 (22.6%)

   

Male

7018 (63.9%)

1107 (77.4%)

1.94 (1.70–2.21, p < .001)

1.05 (0.90–1.22, p = .530)

1.05 (0.91–1.22, p = .500)

Diabetes

No

8375 (76.2%)

1209 (84.5%)

   

Yes

2612 (23.8%)

221 (15.5%)

0.59 (0.50–0.68, p < .001)

0.85 (0.71–1.02, p = .080)

0.85 (0.71–1.02, p = .082)

Hypertension

No

7402 (67.4%)

1030 (72%)

   

Yes

3585 (32.6%)

400 (28%)

0.80 (0.71–0.91, p < .001)

1.27 (1.09–1.48, p = .002)

1.27 (1.09–1.47, p = .002)

Bystander witness

No

5221 (47.5%)

291 (20.3%)

   

Yes

5766 (52.5%)

1139 (79.7%)

3.54 (3.10–4.05, p < .001)

2.27 (1.96–2.64, p < .001)

2.29 (1.97–2.66, p < .001)

Bystander CPR

No CPR

4989 (45.4%)

580 (40.6%)

   

Standard CPR

324 (2.9%)

44 (3.1%)

1.17 (0.84–1.62, p = .351)

0.78 (0.53–1.14, p = .195)

0.75 (0.33–1.67, p = .476)

Compression-only CPR

5674 (51.6%)

806 (56.4%)

1.22 (1.09–1.37, p < .001)

1.05 (0.90–1.22, p = .521)

0.70 (0.52–0.94, p = .018)

AED

No

10,172 (92.6%)

1244 (87%)

   

Yes

815 (7.4%)

186 (13%)

1.87 (1.57–2.21, p < .001)

1.45 (1.18–1.79, p < .001)

1.43 (1.16–1.76, p < .001)

Place

Public

3560 (32.4%)

809 (56.6%)

   

Residence

7427 (67.6%)

621 (43.4%)

0.37 (0.33–0.41, p < .001)

0.66 (0.58–0.76, p < .001)

0.66 (0.57–0.75, p < .001)

Initial ECG

Non-shockable

9659 (87.9%)

497 (34.8%)

   

Shockable

1328 (12.1%)

933 (65.2%)

13.65 (12.07–15.44, p < .001)

8.80 (7.69–10.07, p < .001)

8.85 (7.73–10.12, p < .001)

DA-CPR

No

2756 (25.1%)

456 (31.9%)

   

Yes

8231 (74.9%)

974 (68.1%)

0.72 (0.63–0.81, p < .001)

0.75 (0.64–0.88, p < .001)

0.62 (0.51–0.76, p < .001)

Standard CPR x DA-CPR

     

1.15 (0.46–2.87, p = .769)

Compression-only CPR x DA-CPR

     

1.74 (1.24–2.44, p = .001)

AIC

    

6559

6552

  1. OR Odds ratio; CPR Cardiopulmonary resuscitation; AED Automated electrical defibrillator; ECG Electrocardiography; DA-CPR Dispatcher-assisted CPR; AIC Akaike Information Criterion.
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