Correction to: Treatment of metabolic acidosis with sodium bicarbonate delays progression of chronic kidney disease: the UBI Study

Correction to: Journal of Nephrology (2019) 32:989–1001 10.1007/s40620-019-00656-5

It occurred to us that a simple but significant calculation error was made in Table 2 in the dose of bicarbonate administered. Indeed, contrary to what reported in Table 2, the dose of sodium bicarbonate administered during study was:

Mean (SD) SB administered dose (mmol/kg bw/day)

	Baseline	1 year	2 year	3 year
SC	–	0.14 (0.12)	0.12 (0.03)	0.11 (0.03)
SB	–	0.56 (0.05)	0.55 (0.05)	0.54 (0.06)

We sincerely apologize for the inconvenience. The updated Table 2 has been copied below:

Table 2.

Mean (SD) dose of sodium bicarbonate administered and mean (SD) and range (min–max) of serum bicarbonate (mmol/l) during the study according to study arm allocation

	Baseline	1b year	2b year	3b year
Standard care (SC)	–	0.14 (0.12)	0.12 (0.03)	0.11 (0.03)
Mean (SD) SB administered dose (mmol/kg-bw/day)	–	0.28 (0.23)a	0.24 (0.05)b	0.21 (0.06)c
Mean serum levels of bicarbonate (SD) (mmol/l)	21.4 (2.1)	22.3 (1.9)	21.9 (1.3)	21.9 (1.9)
Range of serum bicarbonate (min–max) (mmol/l)	16–25	17–26	18–26	17–26
Sodium bicarbonate (SB)	–	0.56 (0.05)	0.55 (0.05)	0.54 (0.06)
Mean (SD) SB administered dose (mmol/kg-bw/day)	–	1.13 (0.10)	1.12 (0.11)	1.09 (0.12)
Mean serum levels of bicarbonate (SD) (mmol/l)	21.5 (2.4)	25.0 (2.4)	26.0 (2.4)	26.1 (1.7)
Range of serum bicarbonate (min–max) (mmol/l)	13–26	20–29	21–30	22–30
P value between group comparison	0.006	<0.001	<0.001	<0.001

^a78 patients treated for 2 – 4 months during the first year

^b26 patients treated for 3–5 months during second year

^c33 patients treated for 2–4 months during third year