Community Based Study on Occupational Asthma
To examine the occupations, industries and exposures in the work-place which were associated with a high risk for asthma and other adverse respiratory health effects, with particular emphasis on specific exposures of predominantly female occupations (irritants, detergents and other asthmagens), and of other high risk major occupations which had not been adequately examined.
|Study Design:||Observational Model: Natural History
Time Perspective: Longitudinal
|Study Start Date:||May 1999|
|Estimated Study Completion Date:||April 2003|
Respiratory diseases are strongly related with exposure in the workplace. A considerable proportion of adult onset asthma is associated with these exposures. The importance of occupational risk factors for asthma has been underestimated, particularly among women. The occupational asthma study (ECRHS-OA) forms part of a wider international multicentre survey on respiratory health (European Community Respiratory Health Survey-ECRHS). The first phase of the ECRHS was conducted in 1991/92 and examined risk factors for asthma and atopy in subjects aged 20-44 years. The study updated (ECRHS-II), following-up approximately 17,000 young adults from 12 countries (Australia, Belgium, France, Germany, Iceland, Italy, Norway, Spain, Sweden, Switzerland, UK and USA).
The study provided valid and precise estimates on the importance of specific occupations, industries and exposures in relation to asthma incidence and prevalence, similar estimates for other respiratory symptoms and diseases and also for declines in pulmonary function.
Longitudinal, community-based, multicenter study. Those subjects who took part in the first occupational asthma study survey were re-contacted in 1999, to determine risk factors for incidence and remission of asthma, other respiratory symptoms, atopy, changes in bronchial responsiveness and lung function. Subjects were asked to perform a forced spirometry, methacholine challenge and to provide blood samples for IgE testing. A questionnaire administrated by trained interviewers was delivered requesting information on respiratory symptoms and diseases, socio-demographic factors, tobacco smoking, complete occupational history since the last survey, environmental exposures, family history, diet, treatment and use of health services. Modular occupational questionnaires were developed for subjects employed as cleaners, homemakers, welders, metal workers, nurses, and subjects exposed to organic dusts in the paper and textile industries.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00005755
|Investigator:||Manolis Kogevinas||Municipal Institute of Medical Research|