下列何者不是典型嚴重氣喘患童之肺功能測量儀(spirometry)測量結果?(FVC:forced vital capacity全力吐氣量;\mathrm{FEV}_{1}:forced expiratory volume at one second一秒全力吐氣量。)
\mathrm{FEV}_{1}
\mathrm{FEV}_{1}/ FVC比值<0.80
支氣管擴張反應\mathrm{FEV}_{1}改善值≧12%
運動激發試驗\mathrm{FEV}_{1}值下降≧15%
每天晨間和晚間\mathrm{FEV}_{1}變異度≦20%