Diagnosis counts at the unlinked, CA and 28-day episode levels for admission years 1988–2013
| Unlinked level | CA level | 28-day episode level | ||||
| Diagnosis hierarchy | Hospital hierarchy | Diagnosis based on first admission | Diagnosis based on last admission | |||
| CHD records (n) | 296 659 | 273 793 | 269 614 | 267 389 | 263 313 | 242 966 |
| Diagnosis | ||||||
| STEMI | 37 457 (12.63%) | 34 435 (12.58%) | 33 313 (12.36%) | 32 165 (12.03%) | 32 014 (12.16%) | 33 364 (13.73%) |
| NSTEMI | 29 203 (9.84%) | 24 734 (9.03%) | 23 956 (8.89%) | 21 868 (8.18%) | 22 631 (8.59%) | 23 738 (9.77%) |
| Unstable angina | 72 223 (24.35%) | 65 589 (23.96%) | 63 301 (23.48%) | 64 478 (24.11%) | 60 333 (22.91%) | 59 144 (24.34%) |
| Stable angina | 77 076 (25.98%) | 73 994 (27.03%) | 73 898 (27.41%) | 73 845 (27.62%) | 73 037 (27.74%) | 64 669 (26.62%) |
| Other CHD | 69 070 (23.27%) | 65 161 (23.80%) | 65 751 (24.39%) | 64 632 (24.17%) | 66 148 (25.11%) | 52 688 (21.68%) |
| All MI | 78 315 (26.40%) | 69 049 (25.22%) | 66 664 (24.73%) | 64 434 (24.10%) | 63 818 (24.24%) | 66 487 (27.36%) |
| ACS | 150 538 (50.74%) | 134 638 (49.18%) | 129 965 (48.20%) | 128 912 (48.21%) | 124 151 (47.15%) | 125 631 (51.71%) |
ACS, acute coronary syndrome; CA, contiguous admission; CHD, coronary heart disease; MI, myocardial infarction; NSTEMI, non-STEMI; STEMI, ST elevation myocardial infarction.