CRP and interstitial lung disease: ILD + AD + subgroup, compared to ILD–AD– subgroup, had higher DAS28-CRP (2.6 ± 1.1 vs. 2.0 ± 1.0, p = 0.028) and SDAI scores (9.3 ± 7.1 vs. 5.6 ± 7.3, p = 0.031).