Skin score (>14), skin involvement extent, autoantibodies pattern, FVC (≤ 79%), DLCO (≤ 49%), alveolar score on HRCT (> 6), IL-6 plasma levels (> 0.75 pg/ml) and CRP (> 5 mg/l) were the components of the logistic regression model for alveolitis. Here, CRP is linked to hypersensitivity pneumonitis.