Abstract
PURPOSE: FEV1 /FVC is useful in evaluating obstructive airways disease in school age children. As preschool children can perform reliable spirometry but have short expiratory times, FEV1 cannot always be determined. Furthermore, when measurable, FEV1 /FVC is higher than described in older children. As FEV0.5/FVC and FEV0.75/FVC have been proposed as alternative measures, we aimed to describe these ratios in our population and determine if they could be surrogates for FEV1 /FVC in this age group.
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