Table 5.

Likelihood ratios^* (95% confidence intervals) of brain natriuretic peptide and N-terminal atrial natriuretic peptide for identifying left ventricular systolic dysfunction

Patient group	Brain natriuretic peptide			N-terminal atrial natriuretic peptide
	Positive	Negative		Positive	Negative
Moderate or severe left ventricular dysfunction	2.25 (0.77 to 6.61)	0.83 (0.38 to 1.82)		1.08 (0.58 to 2.02)	0.96 (0.51 to 1.79)
Severe left venrticular dysfunction	2.31 (1.24 to 4.35)	0.37 (0.27 to 0.51)		1.21 (1.04 to 1.42)	0
Fractional shortening <25%	4.25 (1.4 to 12.89)	0.57 (0.32 to 1.0)		1.55 (0.7 to 3.4)	0.74 (0.34 to 1.62)

The likelihood ratio of a positive result shows how much more likely a positive result is to be found in a person with the condition than in a person without it. The likelihood ratio of a negative result shows how much more likely a negative result is to be found in a person without the condition than in a person with it.