Table 7. Adjusted risk of 30-day MACE in sequential Cox models.

Variable in Cox model	Hazard ratio (95% confidence interval)*
	Weekend admission only	Weekend + clinical characteristics	Weekend + clinical + time factors	Weekend + clinical + time + severity factors
Weekend admission	2.13 (1.26-3.60)	2.20 (1.29-3.73)	3.01 (1.73-5.23)	2.84 (1.61-5.00)
Age		1.00 (0.98-1.03)	1.01 (0.98-1.03)	1.00 (0.98-1.03)
Male sex		1.46 (0.74-2.87)	1.25 (0.63-2.45)	1.14 (0.57-2.58)
Hypertension		0.68 (0.37-1.22)	0.81 (0.44-1.46)	0.85 (0.47-1.55)
Diabetes mellitus		0.89 (0.49-1.63)	0.88 (0.48-1.61)	0.89 (0.48-1.65)
Hyperlipidemia		0.79 (0.42-1.48)	0.79 (0.42-1.49)	0.80 (0.42-1.50)
Smoking, current		0.76 (0.40-1.45)	0.78 (0.41-1.52)	0.73 (0.38-1.42)
Previous myocardial infarction		1.67 (0.87-3.21)	1.44 (0.75-2.79)	1.66 (0.78-3.52)
Previous CABG		1.20 (0.28-5.06)	1.33 (0.32-5.55)	1.57 (0.35-6.93)
Symptom-to-admission time			1.00 (1.00-1.00)	1.00 (1.00-1.00)
Admission-to-PCI time			0.97 (0.95-0.98)	0.97 (0.95-0.98)
Baseline Troponin-I elevation				1.79 (0.94-3.41)
Ischemic ECG change				0.68 (0.38-1.20)
TIMI scores				1.01 (0.76-1.34)

^*The hazard ratios are derived from sequential Cox proportional-hazard models that included variables that may affect 30-day MACE.