在所有三个组，血y KL - 40水平与哮喘严重程度正相关，而与一秒用力呼气量负相关。
In all three cohorts, serum YKL-40 levels correlated positively with the severity of asthma and inversely with the forced expiratory volume in 1 second.
在所有三个组，血y KL - 40水平与哮喘严重程度正相关，而与一秒用力呼气量负相关。
In all three cohorts, serum YKL-40 levels correlated positively with the severity of asthma and inversely with the forced expiratory volume in 1 second.
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