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Overall mortality in categorized SP controlled duration groups. SP controlled duration was categorized into SP never controlled group, SP controlled <12 months group, 12–23 months group, 24–35 months group, and >35 months group. The overall mortality was the maximum in patients whose SP never controlled and decreased with longer SP controlled duration. p = 0.046 for trend. PD, peritoneal dialysis; SP, serum phosphorus.
