Table 4. Multivariate analysis of the significant risk factors affecting mortality.

Multivariate				Backward elimination
Risk factor	HR	95% CI	p value	HR	95% CI	P value
AKI	1.38	1.02–1.87	0.037	1.39	1.03–1.88	0.033
Age, per year	1.06	1.04–1.07	<0.001	1.06	1.05–1.07	<0.001
Female sex	1.02	0.75–1.37	0.92	-	-	-
BMI, per unit	0.99	0.97–1.02	0.63	-	-	-
Smoker	1.33	0.98–1.81	0.07	1.31	0.97–1.77	0.076
Family history of ischemic heart disease	0.85	0.63–1.16	0.32	-	-	-
Previous CABG	2.31	1.15–4.66	0.019	2.16	1.09–4.31	0.028
History of stroke	1.65	1.06–2.57	0.026	1.61	1.04–2.50	0.033
History of heart failure	2.49	1.52–4.07	<0.001	2.44	1.51–3.96	<0.001
Cardiogenic shock pre-procedure	2.87	1.53–5.40	0.001	2.66	1.45–4.90	0.002
Cardiac Arrest pre-procedure	3.13	1.93–5.09	<0.001	3.04	1.88–4.92	<0.001
Procedure length per minute	0.99	0.98–1.00	0.20	-	-	-
eGFR on admission per ml/min	0.99	0.98–0.99	<0.001	0.99	0.98–0.99	<0.001
Contrast volume/eGFR ratio	1.04	0.97–1.12	0.27	-	-	-
Peak Troponin T, per 1mg/ml	1.03	1.01–1.04	0.001	1.03	1.01–1.04	0.001
Time to PCI1, per hour	1.06	1.02–1.10	0.003	1.06	1.02–1.10	0.003

AKI = Acute Kidney Injury; BMI = Body Mass Index

CABG = Coronary Artery Bypass Graft, MI = Myocardial Infarction.

PCI = Percutaneous Coronary Intervention.

¹Time to PCI is from symptom onset to balloon dilation and is measured in hours.

LVEF: Due to missing values this variable have been left out in the multivariate analysis.