Table 4.

Multivariate risk of left ventricular systolic dysfunction. Risk is increased if answer is “yes”

Question to assess risk of systolic dysfunction	Odds ratio  (95% CI)	P value
Are there QRS or ST-T changes, or both, in the electrocardiogram?	18 (1.9 to 160)	0.012
Is resting supine heart rate (beats/min)>diastolic blood pressure (mm Hg)?	9 (2.4 to 37)	0.002
Is N-terminal atrial natriuretic peptide >0.8 nmol/l ?	5 (1.1 to 20)	0.040

The prevalence of left ventricular systolic dysfunction (ejection fraction⩽0.45) was brought up to 12% by previous screening. Odds ratios were obtained by analysing 120 patients as six had missing values.