Table 1:

Hospital length of stay (death within 30 days excluded)

	Univariate beta coefficient (95% CI)	P-value	Multivariable beta coefficient (95% CI)	P-value
BI (per unit)	0.004 (0.003, 0.005)	<0.001	0.034 (0.027, 0.094)	<0.001

CI: confidence interval; BI: bypass index.