Serum Levels of Joining Chain-Containing IgA1 Are Not Elevated in Patients with IgA Nephropathy

Table 5

Correlation between J chain deposition and clinical factors.

Variables	Coefficient	value
J-IgA	0.42	0.18
J-IgA/IgA	0.49	0.11
J-IgA1	0.57	0.18
J-IgA1/IgA1	0.21	0.65
24-hour urine protein excretion	-0.14	0.66
Serum creatinine	-0.47	0.12
eGFR	0.31	0.34

J chain: joining chain; J-IgA: J chain-containing IgA; J-IgA1: J chain-containing IgA1; eGFR: estimated glomerular filtration rate. ^aSpearman’s correlation analysis unless otherwise specified. ^beGFR was calculated according to the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation [20].