Table 5

Propensity score (PS)-adjusted HR from time-dependent Cox proportional hazards models for time to coronary angiography in patients with ST-elevation myocardial infarction (STEMI) and non-ST-elevation myocardial infarction/unstable angina (NSTEMI/UA).

Time to coronary angiography*STEMI
Mean time-to-angiography weekday, (hours)Mean time-to-angiography weekend, (hours)PS-adjusted HR (95% CI)
0–1 hour0.550.57 0.89 (0.84 to 0.94)
1–2 hours1.521.530.99 (0.87 to 1.11)
2–5 hours3.273.111.25 (1.00 to 1.56)
NSTEMI/UA
0–2 hours1.891.94 0.54 (0.42 to 0.69)
2–24 hours15.718.3 0.71 (0.65 to 0.77)
24 hour–4 days56.253.9 1.22 (1.09 to 1.36)
4–7 days139.9137.00.94 (0.68 to 1.29)
  • *The time-windows for the time-dependent Cox proportional hazard model were made to satisfy the proportionality assumption throughout time. In the case of NSTEMI/UA, we selected 24 hours as one of the time cut-offs to reflect the European Society of Cardiology guidelines for high-risk patients.

  • Bold items indicate significant effects at the 5% level.