Cost burden following esophagectomy: A single centre observational study

Figure 1 Mediation effects analysis model. a: The effect of drivers of hospital costs on other drivers of hospital costs; b: The effect on hospital costs; c’: The direct effect of drivers of hospital costs on hospital costs adjusted to the mediator (c - ab); c: The total hospital costs, including the mediator variables. The indirect effect is the product of coefficients a and b (ab) and the difference between the c coefficient and c’ coefficient (c-c’).