BTG3 and interstitial lung disease: ANA test positivity was more common in CTD group (p = 0.016 vs. IPAF and p < 0.001 vs. other ILD) and in IPAF group (with respect to other ILD, p = 0.016), whereas cytoplasmic positivity of ANA test was more common in CTD and IPAF group with respect to other ILD (p = 0.012 and p = 0.003, respectively).