Unadjusted and adjusted analyses of variables associated with patient survival to hospital discharge
| Variable | No. (%) of patients*† | OR (95% CI) | ||
|---|---|---|---|---|
| Survived n = 300 | Did not survive n = 7538 | Unadjusted | Adjusted‡ | |
| Age, yr, mean ± SD | 60.1 ± 16.3 | 71.1 ± 15.7 | 0.96 (0.958–0.97) | 0.96 (0.95–0.97) |
| Sex, male | 201/300 (67.0) | 4647/7538 (61.6) | 0.77 (0.61–0.98) | 0.72 (0.54–0.95) |
| Event witnessed by bystander | 224/294 (76.2) | 3007/7488 (40.2) | 4.76 (3.68–6.25) | 2.93 (2.16–3.98) |
| Contact at or above floor 3 | 48/300 (16.0) | 1795/7538 (23.8) | 0.61 (0.44–0.83) | 0.70 (0.50–0.99) |
| Bystander performed CPR | 136/300 (45.3) | 2637/7538 (35.0) | 1.55 (1.23–1.94) | 1.07 (0.83–1.39) |
| 911 response time, min, mean ± SD | 5.8 ± 2.1 | 6.2 ± 2.3 | 0.89 (0.83–0.95) | 0.86 (0.79–0.92) |
| Initial shockable rhythm present | 219/297 (73.7) | 1160/7502 (15.5) | 14.65 (11.39–19.02) | 10.68 (7.98–14.29) |
| Time from arrival of 911 responder to patient contact, min, mean ± SD | 3.2 ± 1.9 | 3.5 ± 2.2 | 0.93 (0.88–0.98) | NA |
Note: CI = confidence interval, CPR = cardiopulmonary resuscitation, NA = not applicable, OR = odds ratio, SD = standard deviation.
↵* Except where indicated otherwise.
↵† Four patients were excluded because of missing outcome data.
↵‡ Adjusted for age, sex, witness status, bystander CPR, 911 response time, initial cardiac rhythm and floor of contact (< 3 v. ≥ 3).