Impaired Pulmonary Function in Schoolchildren Exposed to Passive Smoking

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Abstract
Pulmonary function was evaluated by FEV1, FVC, PEF, MEF50%FVC, MEF25%FVC and MMEF in relation with passive smoking exposure in 143 children aged 6–11 years (mean age = 8.5 ± 1.6). Passive smoking exposure was evaluated by a questionnaire and by measurement of urinary cotinine levels. Children were divided into different groups: no exposure, low exposure and high exposure. The mean values of each pulmonary function test were compared between the groups and between the different evaluations by Student’s t test. The evaluation of passive smoking exposure by questionnaire and by urinary cotinine levels separated homogeneous groups of children. The urinary cotinine levels were significantly lower in the non-exposed children than in the other groups (p 50%FVC, MEF25%FVC and MMEF were significantly reduced in exposed subjects (p

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