Age at the time of enrollment showed significantly increasing trends with more severe asthma, as the body mass index showed an increasing trend in more severe asthma with statistical significance in its trend.
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Associated Factors for Asthma Severity in Korean Children: A Korean Childhood Asthma Study.
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The sentences
Lower maternal education levels and lower ACT scores showed a significant trend with higher asthma severity ( P for trend < 0.001).
The usage of an air purifier during exposure to high levels of outdoor air pollution showed a decreasing trend with greater asthma severity ( P for trend < 0.001).