The true incidence is unknown. UIP is the most common (50%-60%) of the idiopathic<unk>  pneumonia, then NSIP 14%-36%, then DIP/RB-ILD (10%-17%) and AIP (0%-2%)
Idiopathic interstitial pneumonia epidemiology and demographics
Hypersensitivity pneumonitis epidemiology and demographics
Idiopathic pulmonary fibrosis epidemiology and demographics
Eosinophilic pneumonia epidemiology and demographics
Cryptogenic organizing pneumonia epidemiology and demographics
Lymphomatoid granulomatosis epidemiology and demographics
Bronchiectasis epidemiology and demographics
Pulmonary edema epidemiology and demographics