Fig. 2.

Changes in SP levels over time in PD patients. a Overall changes in SP levels over time. b Changes in SP levels over time 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. Patients' SP levels decreased soon after dialysis and returned to hyperphosphatemia later (a). SP levels returned to hyperphosphatemia in 125 (48.8%), 67 (26.2%), 40 (15.6%), and 24 (9.4%) patients at the first, second, third, and more than 4 years after dialysis (b). PD, peritoneal dialysis; SP, serum phosphorus; SD, standard deviation.