Table 1.
Baseline characteristics
| Women | Men | SMD | Missing | |
|---|---|---|---|---|
| n | 14 270 | 29 023 | ||
| Patient characteristics | ||||
| Age, years, median [IQR] | 74.0 [63.0, 84.0] | 71.0 [60.0, 80.0] | 0.211 | 0.0 |
| Age category, n (%) | 0.230 | 0.0 | ||
| 1. 18–39 | 804 (5.6) | 2082 (7.2) | ||
| 2. 40–59 | 1945 (13.6) | 4866 (16.8) | ||
| 3. 60–79 | 6261 (43.9) | 14 426 (49.7) | ||
| 4. 80+ | 5260 (36.9) | 7649 (26.4) | ||
| Resuscitation characteristics | ||||
| Witnessed, n (%) | 8122 (58.2) | 17 382 (61.3) | 0.064 | 2.2 |
| Location of cardiac arrest, n (%) | 0.335 | 0.2 | ||
| 1 At home | 11 752 (82.6) | 20 197 (69.7) | ||
| 2 Public location | 1410 (9.9) | 6221 (21.5) | ||
| 3 Other (nursing home, etc.) | 1071 (7.5) | 2545 (8.8) | ||
| Time from call to EMS arrival, minutes, median [IQR] | 9.0 [6.0, 14.0] | 9.0 [6.0, 15.0] | 0.022 | 7.5 |
| VT/VF, n (%) | 1744 (12.5) | 7316 (25.8) | 0.343 | 2.3 |
| Bystander CPR, n (%) | 8697 (62.1) | 17651 (61.8) | 0.006 | 1.7 |
| Bystander defibrillation, n (%) | 100 (0.7) | 472 (1.7) | 0.087 | 1.7 |
| First responder CPR, n (%) | 3274 (23.7) | 7273 (25.8) | 0.048 | 3.0 |
| First responder defibrillation, n (%) | 214 (1.6) | 926 (3.3) | 0.113 | 3.0 |
| Medical aetiology, n (%) | 12 262 (91.3) | 24 945 (90.8) | 0.018 | 5.5 |
| Socioeconomic factors | ||||
| Disposable income, SEK, median [IQR] | 138 100 [111,400, 167,900] | 167 000 [132,700, 240,900] | 0.199 | 7.8 |
| Educational level, n (%) | 0.074 | 7.8 | ||
| 1 Primary school | 5668 (42.9) | 10 545 (39.4) | ||
| 2 Secondary school | 5142 (39.0) | 1,0931 (40.9) | ||
| 3 Post-secondary ≤2y | 934 (7.1) | 2162 (8.1) | ||
| 4 Post-secondary ≥3y | 1455 (11.0) | 3097 (11.6) | ||
| Crude survival | ||||
| 30-day survival (%) | 879 (6.2) | 3097 (10.7) | 0.163 | 0.0 |
CPR, cardiopulmonary resuscitation; EMS, emergency medical services (ambulance and first responders); IQR, interquartile range; SEK, Swedish kronor; SMD, standardized mean difference; VT/VF, ventricular fibrillation/ventricular tachycardia.