[Respiratory pathology in occupational medicine: evaluation of 3 methods of data collection and research on risk factors].

Three methods of gathering data of respiratory symptoms (using a self questionnaire, a detailed interview and a shortened interview) were compared in 4.206 construction workers in different branches of their profession. There was non significant difference between the replies given, in either sex, to the self questionnaire and those given in the detailed interview by employees of the research bureau.