Table 2

Univariate analysis of 30 day mortality

Variable description	Missing data (%)	Wald score	p Value
Admission characteristics
Sex	0	20	< 0.0001
Age	0	115	< 0.0001
Occurrence of chest pain	0.7	99	< 0.0001
Systolic blood pressure	2.2	62	< 0.0001
Diastolic blood pressure	2.6	54	< 0.0001
Heart rate	2.9	20	< 0.0001
Admission medication
β Blocker	2.2	2.0	0.15
Aspirin	2.2	0.4	0.51
Calcium antagonist	2.2	0.0	0.92
Nitrates	2.2	1.8	0.17
Diuretics	2.1	48	< 0.0001
Antiarrhythmics	2.2	29	< 0.0001
Warfarin	2.2	2.6	0.11
ACE inhibitor	2.2	0.3	0.58
Statin	2.2	3.0	0.08
Medical history
Myocardial infarction	0.2	0.0	0.82
Angina	0.2	1.5	0.21
Cardiac failure	0.3	25	< 0.0001
Hypertension	0.2	4.6	0.03
Coronary artery revascularisation	0.2	1.0	0.31
Arrhythmias	0.3	11	0.001
Stroke	0.2	18	< 0.0001
Diabetes mellitus	0.2	7	0.007
Hyperlipidaemia	0.3	7	0.01
COPD	0.2	1.1	0.29
Surgery	0.2	6.5	0.01
Peripheral vascular disease	0.2	2.7	0.1
Peptic ulcer disease	0.2	11.5	< 0.001
Defibrillation/cardioversion	1.6	7.6	0.006

p Value v reference cohort.
ACE, angiotensin converting enzyme; COPD, chronic obstructive pulmonary disease.