Fig. 3

Changes in β2 microglobulin (Δβ2MG) after the initiation of PD + HD combination therapy over 12 months. PD peritoneal dialysis, HD hemodialysis. We divided the patients into three groups based on changes in β2 microglobulin: increased group, no change group, decreased group. Δβ2MG ranged from − 0.789 mg/L to 0.789 mg/L in the no change group, defined based on the data from 10 stable HD patients. Mean values of Δβ2MG (mean ± standard deviation) at 3, 6, and 12 months were − 3.3 ± 4.3 mg/L, − 3.8 ± 4.0 mg/L, and − 3.4 ± 4.6 mg/L, respectively