Table 2. Effect of NT-proBNP levels on in-hospital mortality and length of stay, Lausanne university hospital, 2013–2015.

	First to fourth quintile (n = 3068)	Fifth quintile (n = 765)	p-value
In-hospital mortality 1
Bivariate	198 (6.5)	155 (20.3)	<0.001
Multivariable-adjusted 3	1 (ref)	1.97 (1.57–2.46)	<0.001
Length of stay (days) 2
Bivariate	14.9 ± 26.5	20.8 ± 24.0	<0.001
Multivariable-adjusted 3	14.9 ± 0.5	20.4 ± 1.0	<0.001

¹ expressed as number of patients (percentage)

² comparisons performed on log-transformed data

³ adjusted for age (continuous), gender, principal diagnoses (heart failure, other heart disease, pneumonia, COPD and other), stage 5 renal failure (yes/no), hospital ward (medicine, surgery, intensive care) and stay in emergency room (yes/no). For in-hospital mortality, results are expressed as number of deaths and percentage (bivariate) or Cox regression (multivariable). For length of stay, results are expressed as average±standard deviation (bivariate) or as multivariable-adjusted average±standard error. Between-group comparisons were performed using student’s t-test (bivariate) or analysis of variance (multivariable).