TABLE 1

Simplified definitions

Entity		Population	Diagnostic criteria	Definition
ILA		Only individuals without known or suspected ILD^#	Clinical-radiological entity	Incidental finding of CT abnormalities affecting more than 5% of any lung zone
Early ILD	Pre-clinical ILD	Individuals at risk for ILD	Clinical-radiological-pathological entity	Any ILD in asymptomatic patients with preserved lung function
Early ILD	Subclinical ILD	Individuals NOT at risk for ILD	Clinical-radiological-pathological entity
Mild ILD		All individuals	Clinical-radiological-pathological entity	Any clinically significant ILD with minor symptoms and/or trivial PFT abnormalities

ILA: interstitial lung abnormalities; ILD: interstitial lung disease; CT: computed tomography; PFT: pulmonary function test. ^#: abnormalities identified during screening for ILD in high-risk groups (e.g. those with rheumatoid arthritis, systemic sclerosis or familial ILD) are not considered as ILA because they are not incidental.