Although rare,<unk>  is the most common form of IIP. The prevalence of<unk>  has been estimated between 14.0 and 42.7 per 100,000 persons based on a USA analysis of healthcare claims data, with variation depending on the case definitions used in this analyses.<unk>  is more common in men than in women and is usually diagnosed in people over 50 years of age. The incidence of<unk>  is difficult to determine as uniform diagnostic criteria have not been applied consistently. A recent study from the USA estimated the incidence of<unk>  to be between 6.8 and 16.3 per 100,000 persons. In the 27 European Union countries, a range of sources estimate an incidence of 4.6–7.4 people per 100,000 of the population, suggesting that approximately 30,000–35,000 new patients will be diagnosed with<unk>  each year. A recent single-centre, retrospective, observational cohort study including incident patients diagnosed with ILD at Aarhus University Hospital (Denmark) between 2003 and 2009 revealed an incidence of 4.1 per 100,000 inhabitants/year for ILD.<unk>  was the most common diagnosis (28%) followed by connective tissue disease-related ILD (14%), hypersensitivity pneumonitis (7%) and non-specific interstitial pneumonia (NSIP) (7%).<unk>  incidence was 1.3 per 100,000 inhabitants/year. Due to a heterogeneous distribution of the disease across European countries, epidemiological data needs to be updated through a Europe-wide registry for ILD and<unk> .
Idiopathic pulmonary fibrosis
Sarcoidosis
Mineral dust airway disease
Hypersensitivity pneumonitis
Allergic bronchopulmonary aspergillosis
Interstitial lung disease
Rheumatoid lung disease
Idiopathic interstitial pneumonia