CRP and rheumatoid arthritis: Inflammatory markers were elevated more in the RA-ILD group than in the comparators (ESR 38.5 ± 27.5 vs. 26.5 ± 20.4 mm/h, P < 0.001 and CRP 1.0 ± 1.8 vs. 0.5 ± 0.8 mg/dL, P < 0.001; Table 1).