The study sought an association between exposure to environmental tobacco smoke at work and two measures of lung function (FEV1 and FVC). Actual lung function was compared with expected. Exposure was measured by cotinine levels and by questionnaire.
Evidence from:
R Chen et al. Occupational and Environmental Medicine. Sept (2001) Vol.58 #9 p 563.
The observed effects were small and may have been reversible.
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