... National Institute of Occupational Health, Ahmedabad – 380 016, India and 5Director, National Institute of Occupational Health, Ahmedabad – 380 016, IndiaEmail: Asim Saha* - asimsaha2311@yahoo.co .in; ... Majumdar4 and HN Saiyed5Address: 1Occupational medicine Division, National Institute of Occupational Health, Ahmedabad – 380 016, India, 2Respiratory Physiology Division, National Institute ... total adult population of 1509. Prevalence of pulmonary function abnormality in India being 10% in adult population, we calculated thesample size for prevalence study keeping acceptable rangeas...