Significant improvements in lung-function developmentwere observed in both boys and girls and in children with asthma and childrenwithout asthma. The proportions of children with clinically low FEV1 (defined as<80% of the predicted value) at 15 years of age declined significantly, from 7.9% to6.3% to 3.6% across the three periods, as the air quality improved (P = 0.001).
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