Table 1

Baseline characteristics

Variable	<75 years (N=1876)	%	>75 years (N=683)	%	χ² (Fisher's)
Male	1380	74	372	55	0.001
Dyslipidaemia	1134	60	418	61	0.7
Current smoker	570	30	34	5	0.001
Known coronary disease	851	45	438	64	0.001
Previous MI	479	26	251	37	0.001
Chronic heart failure	93	5	121	18	0.001
Previous PCI	356	19	123	18	0.3
Previous CABG	234	12	150	22	0.001
Diabetes	512	27	171	25	0.25
Hypertension	1125	60	510	75	0.001
Atrial fibrillation	137	7	139	20	0.001
Peripheral vascular disease	82	4	80	12	0.001
Malignancy	96	5	84	12	0.001
Elevated cardiac biomarkers	1384	74	485	71	0.163
Normal ECG	506	27	155	23	0.03
ST segment deviation (including BBB)	894	48	338	50	0.4
ST elevation	577	31	138	20	0.001
ST depression	224	12	123	18	0.001
Left bundle branch block	73	4	72	11	0.001
Killip 1	1589	85	448	66	0.001
Pulmonary oedema	72	4	60	9	0.001
Cardiac arrest	68	3.6	11	1.6	0.009
Arrhythmia on presentation	115	6	40	6	0.8

BBB, bundle branch block; CABG, coronary artery bypass surgery; MI, myocardial infarction; PCI, per-cutaneous intervention.