Table 2

Diagnosis counts at the unlinked, CA and 28-day episode levels for admission years 1988–2013

Unlinked levelCA level28-day episode level
Diagnosis hierarchyHospital hierarchyDiagnosis based on first admissionDiagnosis based on last admission
CHD records (n)296 659273 793269 614267 389263 313242 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%)
 ACS150 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.