Table 1.
Patient characteristics by multidimensional hospital opportunity-based composite score (OBCS) quartile and missing data
| Characteristic | 1st quartile (n=28,206) | 2nd quartile (n=24,261) | 3rd quartile (n=27,213) | 4th quartile (n=22,092) | Missing OBCS data (n=34,620) | Complete cases (n=101,772) | Total (n=136,392) |
|---|---|---|---|---|---|---|---|
| Hospitals | 56 (28.1) | 57 (28.6) | 41 (20.6) | 45 (22.6) | – | – | 199 (100) |
| OBCS (%, IQR) | 91.5, 3.6 | 94.5, 0.8 | 96.3, 0.7 | 98.3, 1.2 | – | – | 95.3, 3.4 |
| Age (years) | 69.7±13.8 | 69.0±13.7 | 68.6±13.8 | 68.1±13.7 | 68.9±13.9 | 68.9±13.8 | 68.9±13.8 |
| Systolic blood pressure (mmHg) | 141.0±27.8 | 141.3±28.3 | 140.8±28.3 | 139.7±27.7 | 139.5±28.9 | 140.7±28.1 | 140.4±28.3 |
| Heart rate (bpm) | 81.9±22.4 | 81.4±22.7 | 81.2±22.0 | 80.1±21.2 | 82.0±23.1 | 81.2±22.1 | 81.4±22.4 |
| IMD score | 21.8±16.0 | 20.5±16.2 | 20.5±15.7 | 24.5±17.9 | 22.7±141.6 | 21.7±16.5 | 22.0±72.0 |
| Female | 9838 (35.0) | 7997 (33.0) | 8778 (32.3) | 7235 (32.8) | 11,512 (33.5) | 33,848 (33.3) | 45,360 (33.4) |
| Coronary artery catheterization* | 16,707 (61.8) | 16,189 (70.0) | 18,367 (70.1) | 15,547 (72.7) | 22,483 (70.7) | 66,810 (68.4) | 89,293 (68.9) |
| Previous AMI | 7078 (27.1) | 6007 (26.4) | 6812 (25.7) | 5579 (26.0) | 8065 (26.8) | 25,476 (26.3) | 33,541 (26.4) |
| Diabetes mellitus | 5614 (20.3) | 4667 (19.7) | 5208 (19.5) | 4087 (19.0) | 6379 (20.1) | 19,576 (19.6) | 25,955 (19.7) |
| Hypertension | 13,121 (50.1) | 11,320 (50.5) | 13,482 (51.1) | 10,646 (49.6) | 15,200 (50.5) | 48,569 (50.4) | 63,769 (50.4) |
| Chronic renal failure | 1249 (5.0) | 1113 (5.2) | 1409 (5.4) | 920 (4.3) | 1634 (5.6) | 4691 (5.0) | 6325 (5.1) |
| Chronic heart failure | 1512 (6.0) | 1249 (5.8) | 1412 (5.4) | 1052 (4.9) | 1633 (5.6) | 5225 (5.5) | 6858 (5.6) |
| Aspirin on discharge | 23,371 (96.6) | 20,375 (98.4) | 23,630 (99.1) | 19,535 (99.6) | 17,657 (95.0) | 86,911 (98.4) | 10,456 (97.8) |
| Thienopyridine on discharge | 22,232 (93.3) | 19,320 (96.7) | 22,399 (97.4) | 18,658 (98.8) | 9176 (94.7) | 82,609 (96.4) | 91,785 (96.2) |
| Beta-blocker on discharge | 19,933 (90.0) | 17,329 (93.9) | 20,291 (95.8) | 17,088 (98.4) | 14,175 (88.1) | 74,641 (94.3) | 88,816 (93.2) |
| ACEi on discharge | 20,345 (87.3) | 18,131 (91.8) | 21,451 (94.9) | 18,067 (97.5) | 14,263 (85.6) | 77,994 (92.6) | 92,257 (91.5) |
| Statin on discharge | 23,546 (94.7) | 20,477 (97.1) | 23,774 (97.9) | 19,585 (98.9) | 17,427 (93.0) | 87,382 (97.0) | 10,480 (96.4) |
| Cardiac rehabilitation on discharge | 21,560 (82.6) | 20,387 (89.2) | 23,675 (92.4) | 19,811 (96.6) | 14,288 (85.2) | 85,433 (89.8) | 99,721 (89.1) |
| 30-day mortality rate (%, 95% CI) | 2.25 (2.07–2.43) | 2.43 (2.23–2.62) | 1.66 (1.51–1.81) | 1.40 (1.25–1.56) | 3.17 (2.98–3.36) | 1.95 (1.86–2.03) | 2.25 (2.17–2.33) |
| 6-month mortality rate (%, 95% CI) | 7.93 (7.61–8.25) | 6.81 (6.48–7.13) | 6.59 (6.29–6.89) | 5.53 (5.22–5.83) | 8.50 (8.19–8.80) | 6.78 (6.62–6.93) | 7.20 (7.06–7.34) |
Values are n (%) or mean±SD unless otherwise stated. Missing OBCS data refers to one or more component of the OBCS is missing.
*
Coronary artery catheterization refers to any patient being referred for any form of coronary angiography including primary PCI if appropriate.
ACEi, angiotensin-converting enzyme inhibitor; AMI, acute myocardial infarction; IMD, index of multiple deprivation; PCI, percutaneous coronary intervention.