Nonlinear Correlation Between Prognostic Nutritional Index and Disease Activity of Rheumatoid Arthritis: A Cross-Sectional Study

Background

The prognostic nutritional index (PNI) is a composite marker reflecting the nutritional and inflammatory status. Its association with disease activity in rheumatoid arthritis (RA) remains incompletely understood. This study aimed to investigate the relationship between PNI and RA disease activity.