title: Peak expiratory flow and respiratory morbidity: a study among silica-exposed workers in India.
abstract: BACKGROUND
  The present cross-sectional study was carried out among 136 quartz stone grinders with the objective of studying the peak expiratory flow (PEF) and the associated epidemiological factors.
  
  
  METHODS
  Interview technique was used to record demographic characteristics and occupational history on a predesigned proforma, which included questionnaires regarding demographic, occupational and clinical characteristics. This was followed by complete medical examination and measurement of PEF using Spirovit SP-10. The study included 75 (55.1%) male and 61 (44.9%) female silica-exposed workers. The mean age of the subjects was 31.77 +/- 9.99 years whereas the mean duration of exposure was 2.74 +/- 1.65 years. The mean PEF was found to be 5.16 +/- 2.1 L/min.
  
  
  RESULTS
  In the present study the PEF was significantly reduced in those having respiratory morbidity on both unadjusted and adjusted analyses.
  
  
  CONCLUSIONS
  This suggests that along with the restrictive pathology caused by free silica dust, obstructive changes are also encountered in silica-exposed workers.
authors.affiliation: National Institute of Occupational Health, Ahmedabad, Gujarat, India. rajitiwari2810@yahoo.co.in
authors.forename: Rajnarayan R
authors.initials: RR
authors.lastname: Tiwari
authors.forename: Yashwant K
authors.initials: YK
authors.lastname: Sharma
authors.forename: Habibullah N
authors.initials: HN
authors.lastname: Saiyed
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D004391:Dust; D005260:Female; D006801:Humans; D007194:India / Q000453:epidemiology; D008168:Lung / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D016273:Occupational Exposure / Q000009:adverse effects*; D010366:Peak Expiratory Flow Rate / Q000502:physiology*; D011791:Quartz / Q000009:adverse effects; D012143:Respiratory Physiological Phenomena; D012307:Risk Factors; D012829:Silicosis / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology*
chemical_list: D004391:Dust; D011791:Quartz