Variable | Missing (%) | Value | Imputed value | p-value* |
---|---|---|---|---|
Time from chest pain to ECG (median (IQR) minutes) | 321 (31.6 %) | 78 (41–148) | 81 (20–142) | 0.12 |
Treatment delay (median (IQR) minutes from ECG to PCI) | 139 (13.7 %) | 64 (51–84) | 64 (47–82) | N/A |
First ECG | 143 (14.1 %) | <0.001 | ||
- General practitioner | 25 (2.9 %) | 34 (3.3 %) | ||
- Ambulance | 707 (80.9 %) | 809 (79.6 %) | ||
- Hospital | 142 (16.2 %) | 174 (17.1 %) | ||
Weekend presentation | 0 (0 %) | 291 (28.6 %) | 291 (28.6 %) | 0.92 |
Weekday evening presentation | 152 (14.9 %) | 385 (44.5 %) | 450 (44.2 %) | 0.15 |
Month of discharge | 0 (0 %) | N/A | N/A | 0.72 |
Interhospital transfer for PCI | 8 (0.8 %) | 199 (19.7 %) | 200 (19.7 %) | <0.001 |
Systolic blood pressure on admission (mean (SD) mmHg) | 45 (4.4 %) | 130 (26) | 130 (27) | 0.82 |
Heart rate on admission (mean (SD) beats/min) | 161 (15.8 %) | 75 (18) | 75 (18) | 0.48 |
Resuscitation | 1 (0.1 %) | 99 (9.7 %) | 99 (9.7 %) | 0.31 |
Acute heart failure on admission | 54 (5.3 %) | 47 (4.9 %) | 58 (5.7 %) | <0.001 |
Cardiogenic shock on admission | 71 (7.0 %) | 37 (3.9 %) | 46 (4.5 %) | 0.06 |
Creatinine level on admission (median (IQR) mmol/L) | 112 (11.0 %) | 78 (66–91) | 77.8 (65.0–90.6) | 0.03 |
Nr of diseased vessels | 22 (2.2 %) | 0.56 | ||
- One | 555 (55.8 %) | 566 (55.7 %) | ||
- Two | 264 (26.5 %) | 269 (26.4 %) | ||
- Three | 176 (17.7 %) | 182 (17.9 %) | ||
Location stenosesa | ||||
- Left main | 7 (0.7 %) | 27 (2.7 %) | 27 (2.7 %) | 0.20 |
- Right coronary | 6 (0.6 %) | 565 (55.9 %) | 569 (55.9 %) | 0.10 |
- Left anterior descending | 5 (0.5 %) | 648 (64.0 %) | 652 (64.1 %) | 0.03 |
- Circumflex | 7 (0.7 %) | 400 (39.6 %) | 405 (39.8 %) | 0.06 |