Table.

Likelihood ratios for screening tests for left ventricular systolic dysfunction. Any combination of tests is defined as being positive if any of the individual components are positive

Screening criteria	Specificity (%)	Sensitivity (%)	Likelihood ratio if test negative	Likelihood ratio if test positive	Posterior probability if test negative* (%)	Posterior probability if test positive* (%)
Myocardial infarction†	91	33	0.74	3.62	26	63
Electrocardiogram‡	87	41	0.68	3.13	24	60
Chest radiograph§	45	65	0.79	1.17	27	36
Brain natriuretic peptide¶	34	88	0.35	1.32	15	38
Myocardial infarction or
Electrocardiogram	82	61	0.48	3.29	19	61
Chest radiograph	37	83	0.46	1.32	18	38
Brain natriuretic peptide	27	90	0.38	1.23	15	37
Myocardial infarction or electrocardiogram or
Chest radiograph	31	83	0.53	1.22	20	36
Brain natriuretic peptide	22	91	0.42	1.17	16	35
Myocardial infarction or chest radiograph or brain natriuretic peptide	14	91	0.62	1.06	23	33
Any test	11	92	0.78	1.03	27	33

^*Prevalence (prior probability) of left ventricular systolic dysfunction assumed to be 32%. 

^†Positive if there is a history of myocardial infarction. 

^‡Positive if Q waves, bundle branch block, left ventricular hypertrophy, or T wave present. 

^§Positive if pulmonary oedema or cardiomegaly present. 

^¶Positive if concentration >17.9 pg/ml.