CRP and interstitial lung disease: ILD + group, compared to ILD– group, had higher DAS28-CRP (2.4 ± 1.0 vs. 2.1 ± 1.0, p = 0.014) and SDAI scores (7.6 ± 6.4 vs. 5.8 ± 7.2, p = 0.034).