TABLE 1

Inclusion and exclusion criteria for screening articles

DomainInclusion criteriaExclusion criteria
Study type/designPooled data analysis of cohort or case–control studiesEcological study case series
Meta-analysis of cohort or case–control studies
Systematic review of cohort or case–control studies
Cohort study
Case–control study
Study populationNever-smokers (<100 cigarettes in lifetime)
ExposureIndoor or residential radon exposureMining radon exposure
ComparatorNo or lower radon exposure
OutcomeLung cancer diagnosis or death
Time of publicationPublished from 1 January 1990 to 5 March 2020Published before 1990
Publication typeFull-text published articleEditorials, conference proceedings, abstracts, posters, narrative reviews, commentaries, grey literature
LanguageEnglishLanguage other than English