对比中国普通人中哮喘发生率只有4.2%，奥运游泳选手居然有19%的发病率也是太不寻常。

According to a study published in the Journal of Allergy and Clinical Immunology, 12–25% of Olympic swimmers have asthma each year. This is higher than other Olympic sports, and swimming events often have more participants with asthma than other aquatic events. For example, in 2008, synchronized swimmers and open water swimmers also had high asthma rates