Table 1 Prevalence of risk factors of patients undergoing elective and non‐elective stent placement.

Patient risk factor	Elective (n = 1951)	Non‐elective (n = 933)
Age at intervention (years)	60.3 (53.6–67.4)	61.2 (53.4–69.4)
Women	27.9%	22.5%**
NYHA dyspnoea class >II	9.5%	29.2%**
AMI	3.9%	39.4%**
Unstable angina	6.7%	55.2%**
Cardiogenic shock	0.0%	2.1%**
Family history of CHD	51.1%	47.1%*
Hypercholesterolaemia	85.3%	84.6%
Hypertension	49.5%	42.4%**
Smoking history	68.1%	70.2%
Diabetes	13.2%	12.9%
Peripheral vascular disease	4.4%	4.1%
Cerebrovascular disease	4.4%	5.6%
Renal dysfunction	1.0%	0.9%
Respiratory disease	5.6%	6.3%
Ejection fraction <50%	16.6%	32.1%**
Triple vessel disease	12.0%	16.0%**
Left main stem >50%	1.3%	1.8%
Prior CABG	7.4%	5.6%

*p<0.05; **p<0.001.

AMI, acute myocardial infarction; CABG, coronary artery bypass grafting; CHD, coronary heart disease; NYHA, New York Heart Association.