Association between Rheumatoid Arthritis and the Incidence of IgA Nephropathy.

ABSTRACT:

Introduction: IgA nephropathy and rheumatoid arthritis are both common autoimmune diseases, but epidemiological data are limited on the relationship between these two diseases. We aimed to assess the association between rheumatoid arthritis and the risk of developing IgA nephropathy.

Methods

In this study, we analyzed 4,311,393 adults using a nationwide epidemiological database in Japan. The definitions of rheumatoid arthritis and IgA nephropathy were based on ICD-10 codes. After excluding individuals with a prior history of IgA nephropathy, study participants were categorized into two groups according to the presence of rheumatoid arthritis. The primary outcome was the incidence of IgA nephropathy between January 2005 and May 2022.

Results

Median (interquartile range) age

SUBMITTER: Azegami T 

PROVIDER: S-EPMC12165629 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature