Figure 1

Sensitivity and specificity (and CI95%) versus symptoms in children of reduced function parameters. ROC = Receiver Operating Characteristic. ^aFVC = forced vital capacity; ^bFEV₁= forced expiratory volume in one second; ^cFEV_0.75 = forced expiratory volume in 3/4 of a second; ^dFEV_0.5 = forced expiratory volume in half a second; ^eMEF₇₅ = instantaneous expiratory flow when 25% of FVC has to be expired. ^fMEF₅₀ = instantaneous expiratory flow when 50% of FVC has to be expired. ^gMEF₂₅ = instantaneous expiratory flow when 75% of FVC has to be expired