Fig. 3

Three-dimensional graph showing the association of body mass index with in-hospital death and the length of stay.The figure concurrently shows their interactive effect in the multivariable model with the reference of an estimated glomerular rate of 45 ml/min/1.73 m², and a body mass index of 22 kg/m². a Three-dimensional plot of the odds ratio for in-hospital mortality. b Contour plot of the odds ratio for in-hospital mortality. The solid black curve indicates the same odds ratio. c Three-dimensional plot of the coefficients for differences in length of stay (days). d Contour plot of the coefficients for the difference in the length of stay (days). The solid black curve indicates the same coefficient