Table 1:
Baseline characteristics of the study cohort of 6784 patients with acute myocardial infarction, by charted record of history of depression
| Characteristic | History of depression, no. (%)n = 680 | No history of depression, no. (%)n = 6104 |
|---|---|---|
| CTAS triage score* | ||
| 1 | 40 (6.1) | 294 (4.9) |
| 2 | 358 (54.8) | 3713 (62.4) |
| 3 | 223 (34.2) | 1799 (30.2) |
| 4 | 30 (4.6) | 136 (2.3) |
| 5 | 2 (0.3) | 10 (0.2) |
| Age, yr, mean (SD) | 70.9 (14.1) | 69.2 (14.0) |
| Sex, male | 331 (48.7) | 3882 (63.6) |
| Income quintile† | ||
| 1 | 168 (24.8) | 1419 (23.5) |
| 2 | 128 (18.9) | 1309 (21.5) |
| 3 | 141 (20.8) | 1185 (19.5) |
| 4 | 123 (18.1) | 1125 (18.5) |
| 5 | 118 (17.4) | 1040 (17.1) |
| Came to emergency department from | ||
| Home | 623 (91.9) | 5285 (86.7) |
| Doctor’s office | 31 (4.6) | 410 (6.7) |
| Other | 24 (3.5) | 404 (6.6) |
| Chest pain at presentation | 434 (63.8) | 4412 (72.3) |
| Presence of shortness of breath | 307 (45.2) | 2276 (37.3) |
| One or more cardiac risk factors‡ | 556 (81.8) | 4622 (75.7) |
| Two or more cardiac risk factors‡ | 450 (66.2) | 3626 (59.4) |
| History of coronary artery disease | 315 (46.3) | 2544 (41.7) |
| Arrival by ambulance | 410 (60.3) | 2737 (44.8) |
| Time of day | ||
| Daytime (0800–1600) | 287 (42.2) | 2674 (43.9) |
| Evening (1601–0000) | 231 (34.0) | 1979 (32.5) |
| Night (0001–0800) | 162 (23.8) | 1437 (23.6) |
| Time of week, weekend | 192 (28.2) | 1709 (28.0) |
| Hospital type | ||
| Teaching (13 sites) | 134 (19.7) | 1151 (18.9) |
| Community (73 sites) | 521 (76.6) | 4725 (77.4) |
| Small (10 sites) | 25 (3.7) | 228 (3.7) |
| PCI hospital | 152 (22.4) | 1425 (23.4) |
| AMI volume of emergency department§ | ||
| Low (24 sites) | 92 (13.7) | 704 (11.6) |
| Moderate (18 sites) | 81 (12.1) | 789 (13.0) |
| High (12 sites) | 93 (13.8) | 843 (13.9) |
| Very high (36 sites) | 406 (60.4) | 3728 (61.5) |
| Length of hospital stay, d, median (IQR) | 6.0 (4–9) | 5.0 (4–9) |
| Length of hospital stay, d, mean (SD) | 8.2 (9.1) | 7.3 (6.9) |
| Mortality | ||
| 30-day | 109 (16.0) | 635 (10.4) |
| 90-day | 145 (21.3) | 827 (13.6) |
| 1-year | 211 (31.0) | 1202 (19.7) |
Note: AMI = acute myocardial infarction, CTAS = Canadian Emergency Department Triage and Acuity Scale, IQR = interquartile range, PCI = percutaneous coronary intervention, SD = standard deviation.
*
Unknown for 179 patients.
†
Unknown for 28 patients.
‡
Diabetes mellitus, hypertension, smoker or dyslipidemia.
§
Volume was defined as follows: < 100 AMI patients/yr = low volume; 101–200 patients/yr = moderate; 201–300 patients/yr = high; ≥ 301 patients/yr = very high.