Fig. 5

Bar chart for cost benefit ratio in different groups. To compare cost/benefit ratio between the different groups and subgroups, calculate the incremental costs mean and divide it by the total benefit score mean, as the following: Incremental costs mean /benefit mean in HDF group = 554/4.78 = 116(EGP/benefit). Incremental costs mean /benefit mean in HD group = 207 /2 = 103(EGP/benefit). Incremental costs mean /benefit mean in once subgroup = 362.4/4.11 = 88 (EGP/benefit). Incremental costs mean /benefit mean in twice subgroup = 727.8/5.4 = 134(EGP/benefit)