Screening for abnormal lung function in children with OSA
We evaluated the lung function in 483 children with OSA, and then divided the patients with abnormal lung function into mild, moderate and moderate-severe groups based on the severity of lung dysfunction (Table 1) .
Analysis of risk factors for abnor mal lung function in children with OSA
The Chi-squared test was used to assess risk factors for abnormal lung function in children with OSA. Our results showed that the incidence of abnormal lung function among children with OSA was closely related to a previous history of chronic cough (χ2=53.504, P<0.001), wheezing (χ2=40.136, P<0.001), familial allergic diseases (χ2=4.073, P=0.044), and asthma (χ2=197.700, P<0.001) (Table 2) . A multivariate logistic analysis indicated that a previous history of chronic cough (P<0.001) or a previous history of asthma (P<0.001) were independent risk factors for abnormal lung function in children with OSA(Table 3) .