Correction to: Pediatr Nephrol.

https://doi.org/10.1007/s00467-021-05114-8

The original version of this article unfortunately contained a mistake. During the process of typesetting, corrections to the figure legends of figs. 4 and 5 were not carried out completely. The publisher apologizes for this mistake. Below, the figures with the correct legends are presented below.

Fig. 4
figure 1

Primary endpoint: A) Mean Single pool kt/V at different testing points, A) ITT = intention to treat population, B) LOCF = last observation carried forward. V0 Baseline, V1 post first intervention period (12 weeks), V2 post second intervention period (24 weeks). Intervention (training) Waiting control

Fig. 5
figure 2

Exemplary secondary endpoint: Mean elimination of low molecular substances – no changes between V0 to V2 for (A) blood urea, (B) serum creatinine, (C) serum phosphate and (D) mean double Pool Kt/V. Intervention (training) Waiting control