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

Table 3

Correlation between serum J-IgA1 and clinical factors in patients with IgA nephropathy.

Variables	J-IgA		J-IgA/IgA		IgA1		J-IgA1/IgA1
	^aCoefficient	value	Coefficient	value	Coefficient	value	Coefficient	value
24-hour urine protein excretion	0.13	0.20	-0.06	0.54	-0.03	0.89	-0.01	0.98
Serum creatinine	0.16	0.11	0.16	0.10	-0.10	0.97	0.17	0.30
eGFR^b	-0.14	0.15	-0.16	0.11	0.07	0.74	-0.34	0.11

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].