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In contrast, only %∆ of forced vital capacity, forced expiratory volume in 1 second (FEV1), and FEF25%-75% (forced expiratory flow 25%-75%) were significantly different between groups. Multiple logistic regression analysis revealed that %predicted of R5, %∆R5, %predicted of FEV1 and %∆FEV1 were the predictive factors for predicting the future loss of asthma control. The following cutoff values demonstrated the best sensitivity and specificity for predicting loss of asthma control %predicted of R5=91.28, %∆R5=21.2, %predicted of FEV1=89.5,