Journal
JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL MEDICINE
Volume 55, Issue 12, Pages 1421-1425Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/JOM.0b013e3182a641e7
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Objective: To assess the annual lung function decline associated with the reduction of secondhand smoke exposure in a high-altitude industrial workforce. Methods: We performed pulmonary function tests annually among 109 high-altitude gold-mine workers over 5 years of follow-up. The first 3 years included greater likelihood of exposure to secondhand smoke exposure before the initiation of extensive smoking restrictions that came into force in the last 2 years of observation. Results: In repeated measures modeling, taking into account the time elapsed in relation to the smoking ban, there was a 115 +/- 9 (standard error) mL per annum decline in lung function before the ban, but a 178 +/- 20 (standard error) mL per annum increase afterward (P < 0.001, both slopes). Conclusion: Institution of a workplace smoking ban at high altitude may be beneficial in terms of lung function decline.
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