Table 2

Baseline characteristics of participants by hospital

Hospital A (n=762)Hospital B (n=272)Hospital C (n=315)Hospital D (n=300)
Age (mean; SD)*65.1 (12.7)62.9 (12.5)63.8 (12.4)63.4 (13.0)
Male sex512/655 (78%)183/246 (74%)238/315 (76%)226/300 (75%)
Current smoker191/660 (29%)95/240 (40%)95/300 (32%)97/273 (36%)
IMD score (median; IQR)†12.2 (7.1–21.7)20.5 (10.1–39.2)
WIMD rank (median; IQR)‡817 (334–1478)902 (553–1314.5)
Diabetes91/700 (13%)33/243 (14%)70/310 (23%)37/283 (13%)
Hypertension275/663 (41%)42/238 (18%)143/282 (51%)141/272 (52%)
Previous PCI71/701 (10%)35/242 (14%)27/310 (9%)24/299 (8%)
Previous CABG21/704 (3%)7/243 (3%)5/308 (2%)4/285 (1%)
Previous MI88/707 (12%)40/240 (17%)33/312 (11%)32/288 (11%)
PPCI597/655 (91%)220/243 (91%)267/295 (91%)223/259 (86%)
No PPCI58/655 (9%)23/243 (9%)28/295 (9%)36/259 (14%)
Length of stay (median; IQR) days§3 (2–4)2 (1–3)3 (1–4)2 (1–4)
  • Values are numbers (percentages) unless otherwise stated.

  • The total number of participants in each hospital are patients with any data available.

  • Missing data by hospital (hospital A, hospital B, hospital C, hospital D):

  • *Eight patients (1, 0, 0, 7).

  • †One hundred and seventy-nine patients (169, 10, not collected for hospitals C and D).

  • ‡Data missing for 92 patients (not collected for hospitals A and B, 80, 12).

  • §Data missing for 250 patients (109, 2, 17, 122).

  • CABG, coronary artery bypass grafting; IMD, Index of Multiple Deprivation (low value reflects low level of multiple deprivation); MI, myocardial infarction; PCI, percutaneous coronary intervention; PPCI, primary percutaneous coronary intervention; SMD, standardised mean difference; WIMD, Welsh Index of Multiple Deprivation (low value reflects high level of multiple deprivation).