[Factors associated with participation in chest X-ray screening by young and middle aged residents].

: We investigated the factors that affect participation rates in chest X-ray mass screenings among 20-59 year-old residents in A city, Kagawa prefecture. 1) Participation rates in employees and non-employees were 78.3% and 33.9% respectively. In the employees whose firms do not provide health check-ups, participation rate was 15.9%. 2) Among participants, about 90% of the employees whose firms do not provide health check-ups and about 60% of non-employees utilized mass screenings provided by the local government. 3) Among non-participants, 53.7% of the employees whose firms do not provide health check-ups and 70% of the others (employees whose firms provide health check-ups and non-employees) were aware of the screening system. Most of the young did not know of the system. 4) Principal reasons for nonparticipation were "inconvenient" and "unnecessary because healthy" in job holders and "unnecessary because healthy" in non-job holders. 5) Participants had better health practices than non-participants. Participation rates of chest X-ray mass screenings were high in employees and low in non-employees. Local governments are expected to supplement the existing mass screening system at work-sites by providing accessibility screening. In tuberculosis prevention, nonparticipation in mass screenings is one of the main issues. The association between participation and health practice suggests that methods for linking with primary prevention activities are necessary for stimulating interest and promoting participation in mass screenings.