CRP and interstitial lung disease: Following this initial selection, each article was thoroughly read, and its most relevant findings were compiled in a table, including authors and year of publication, country, qualitative assessment, study type, age (years), number of female participants (n), clinical manifestations of RA-ILD, tomographic patterns, spirometric changes, smoking status, ACPA positivity, C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), and other positive biomarkers present in the sample.