Table 2.
OHCAs occurring in high-SES versus low-SES districts.
| Characteristics | ALL | High SES | Low SES | p-Value |
|---|---|---|---|---|
| OHCA patients – N (%) | 3573 | 1914 | 1659 | |
| Age (years) (mean ± SD) | 73.0 ± 16.0 | 72.9 ± 16.3 | 73.0 ± 15.7 | 0.93 |
| Male | 2226 (62.3%) | 1188 (62.1%) | 1038 (62.6%) | 0.76 |
| Witnessed collapse | 1012 (28.3%) | 558 (29.2%) | 454 (27.4%) | 0.24 |
| EMS intervals (min) (mean ± SD) | ||||
| Response time | 6.4 ± 3.3 | 6.3 ± 3.2 | 6.5 ± 3.4 | 0.049 |
| Scene time | 13.0 ± 5.6 | 13.7 ± 5.6 | 12.3 ± 5.5 | <0.01 |
| Transportation time | 4.5 ± 2.8 | 4.1 ± 2.6 | 5.0 ± 2.9 | <0.01 |
| Total pre-hospital time | 23.9 ± 6.4 | 24.0 ± 6.3 | 23.8 ± 6.6 | 0.23 |
| OHCA unrecognized by online dispatcher – N (%) | 1779 (49.8%) | 869 (45.4%) | 910 (54.9%) | <0.01 |
| Outcomes – N (%) | ||||
| Bystander CPR | 617 (17.3%) | 376 (19.6%) | 241 (14.5%) | <0.01 |
| Sustained ROSC | 933 (26.1%) | 542 (28.4%) | 391 (23.6%) | <0.01 |
| Survival to discharge | 197 (5.5%) | 128 (6.8%) | 69 (4.3%) | <0.01 |
| CPC1 and 2 | 124 (3.5%) | 74 (3.9%) | 50 (3.1%) | 0.18 |
N, number; CPR, cardiopulmonary resuscitation; OHCA, out-of-hospital cardiac arrest; SD, standard deviation; EMS, emergency medical service; ROSC, return of spontaneous circulation; CPC, cerebral performance category.