Correction

Sarcina C, Tinelli C, Ferrario F, Pani A, De Silvestri A, Scaini P, Del Vecchio L, Alberghini E, Buzzi L, Baragetti I, Pozzi C. Changes in proteinuria and side effects of corticosteroids alone or in combination with azathioprine at different stages of IgA nephropathy. Clin J Am Soc Nephrol 11: , 2016.

Due to author error, Table 2 contains several incorrect values. The corrected values are bolded below:

Table 2. - Multivariate analysis evaluating association between treatment and time-average proteinuria over time

Parameter	Coefficient (95% CI)	P Value
Model 1
Proteinuria at baseline, g/d
<2	Reference
2–2.9	0.73 (0.38–1.08)	<0.001
≥3	2.02 (1.17–2.88)	<0.001
Treatment
None	Reference
CS	−0.96 (−1.17 to −0.75)	<0.001
CS+A	−0.88 (−1.10 to −0.66)	<0.001
Use of RAS blockers	0.16 (0.02–0.30)	0.12
eGFR at baseline
≥60 ml/min per 1.73 m 2 (CKD 1–2)	Reference
30–59.9 ml/min per 1.73 m 2 (CKD 3)	0.14 (0.02–0.26)	<0.001
<30 ml/min per 1.73 m 2 (CKD 4)	0.47 (0.26–0.68)	<0.001
Interaction between TAp at baseline and treatment
TAp<2 g/d and no treatment	Reference
TAp 2–2.9 g/d and CS	−0.37 (−0.76 to 0.01)	0.06
TAp 2–2.9 g/d and CS+A	−0.43 (−0.84 to −0.02)	0.04
TAp≥3 g/d and no treatment	NP
TAp≥3 g/d and CS	−1.44 (−2.32 to −0.57)	0.001
TAp≥3 g/d and CS+A	−0.66 (−1.54 to 0.22)	0.14
Model 2
eGFR at baseline
CKD 1–2	Reference
CKD 3	−0.27 (−0.73 to 0.20)	0.26
CKD 4	1.29 (0.96–1.62)	<0.001
Treatment
None	Reference
CS	−1.21 (−3.14 to −1.02)	<0.001
CS+A	−0.99 (−1.19 to −0.78)	<0.001
Use of RAS blockers	0.11 (−0.03 to 0.25)	0.12
Proteinuria (g/d) at baseline
<2 g/d	Reference
2–2.9 g/d	0.39 (0.27–0.51)	<0.001
≥3 g/d	0.92 (0.77–1.07)	<0.001
Interaction between eGFR at baseline and treatment
CKD 1–2 and no treatment	Reference
CKD 3 and CS	0.57 (0.08–1.06)	0.02
CKD 3 and CS+A	0.32 (−0.18 to 0.83)	0.21
CKD 4 and no treatment	NP
CKD 4 and CS	−1.17 (−1.58 to −0.77)	<0.001
CKD 4 and CS+A	NP

Model 1: model with interaction between proteinuria at baseline and treatment; model 2: model with interaction between eGRF at baseline and treatment. Results are expressed as coefficient with their 95% confidence interval (95% CI); the coefficient represents the mean variation of outcomes for unit difference of quantitative predictors or between levels of categorical or ordinal predictors. CS, corticosteroids; CS+A: corticosteroids plus azathioprine; RAS, renin-angiotensin system; TAp, time-average proteinuria. NP, not possible for collinearity and empty strata.