Table 2.

Multiple linear regressions of Gd-IgA1 (mg/dL) on age, sex, race, and diagnosis of IgAN (n = 174)

Independent variable	Regression coefficient (95% confidence interval)	p value
Age (years)	0.010 (0.002 to 0.019)	0.018
Male (Ref: female)	0.064 (−0.155 to 0.284)	0.564
Greek (Ref: Japanese)	0.550 (0.323 to 0.778)	<0.001
IgAN (Ref: HC)	0.550 (0.308 to 0.791)	<0.001

Gd-IgA1, galactose-deficient IgA1; IgAN, IgA nephropathy; HC, healthy control.