Müsellim, BenanOkumuş, GülferAkgün, MetinÇetinkaya, ErdoğanTuran, OnurAkkoçlu, AtilaHazar, ArmağanKöktürk, NurdanÇalışır, Haluk Celalettin2024-05-222024-05-222014-011752-69811752-699Xhttps://onlinelibrary.wiley.com/doi/10.1111/crj.12035https://hdl.handle.net/11452/41516Introduction: There is very few data on the epidemiological features of interstitial lung diseases (ILD) in the literature. These studies on this subject suffer from limited number of patients. Objective: The goal of this study was to evaluate the epidemiological features of ILD in Turkey. Methods: Fifty-four investigators, 31 centres in 19 cities from six regions of Turkey, participated in the study. Two thousand two hundred forty-five newly diagnosed patients (51.8% females), led by Turkish Thoracic Society Clinical Problems Study Group, enrolled in this prospective study. Results: The mean age was 51.8±16.7 years. The mean age among males was 50.5±18.6 years and 53.0±14.6 years among females (P<0.001). 23.8% of the cases had ILD with known causes, while 39.4% were in granulomatous group, 23.7% were idiopathic, and 4.4% were in the unclassified group. Overall, histopathologically confirmed diagnosis rate was 40.4%. Sarcoidosis was the most common disease (37%), whereas cases with idiopathic pulmonary fibrosis (IPF) constituted 19,9% of patients. 53% of the sarcoidosis patients were females, and the ratio reaches to 75% under 50 years of age (for this group, IPF ratio is %3). In contrast, sarcoidosis and IPF ratios were equal in males (25%). Sarcoidosis was 8% in men over 50, while IPF was %45. Conclusion: The overall incidence of ILD in Turkey was computed to be 25.8/100000.eninfo:eu-repo/semantics/closedAccessDistributionEpidemiologyIncidenceInterstitial lung diseasesIdiopathic pulmonary-fibrosisSarcoidosisPrevalenceRespiratory systemAdultAgedFemaleHumansIdiopathic pulmonary fibrosisIncidenceLung diseases, interstitialMaleMiddle agedProspective studiesSarcoidosis, pulmonaryTurkeyArticle0003335278000072-s2.0-8489183003455628123711298https://doi.org/10.1111/crj.12035Respiratory systemFibrosing Alveolitis; Interstitial Pneumonia; NintedanibAdultAgeArticleDisease classificationFemaleGranulomatosisHistopathologyHumanInterstitial lung diseaseMajor clinical studyMaleMiddle agedPriority journalProspective studySarcoidosisTurkey (republic)