Fig. 1From: Serum KL-6 levels reflect the severity of interstitial lung disease associated with connective tissue diseaseSerum KL-6 level of the study population according to the presence of ILD in each CTD. CTD, connective tissue disease; ILD(+), presence of interstitial lung disease; ILD(−), absence of interstitial lung disease; IM, inflammatory myositis; RA, rheumatoid arthritis; SS, Sjogren’s syndrome; SLE, systemic lupus erythematosus; SSc, systemic sclerosisBack to article page