n the S-HPT group, six patients were treated with calcium acetate, whereas in the M-HPT group, 11 were taking calcium acetate. Except for two patients in the S-HPT group who underwent dialysis for 2 h extra per week, all patients of both groups were receiving dialysis 4 h thrice a week. All patients had a native fistula as the type of dialysis access. Half of the patients in the S-HPT group and 73% in the M-HPT group were using polysulphone membrane dialyzers. The remaining patients were using cellulose acetate membrane.