Table 2.

Least squares linear regression of plasma BNP

Variable	Coefficient	Std Error	T	P
Constant	-3.175	17.016	-0.187	0.8523
Atrial Fibrillation	46.953	7.214	6.509	< 0.0001
Heart Failure	50.057	11.538	4.338	< 0.0001
Chronic Renal Failure	36.802	11.696	3.147	0.0021
LA dimension	1.404	0.475	2.957	0.0037

In the regression equation, atrial fibrillation, heart failure, and chronic renal failure are indicator variables, coded 1 for subjects with past or present disease and 0 without disease. Units of the other variables are as in Table 1. Summary statistics relating to the regression fit include ANOVA (F_4,126 = 27.6, p < 0.0001; adjusted R² = 0.45). Plasma BNP was associated with atrial fibrillation, heart failure, chronic renal failure, and LA dimension, independently.