Reply to: Interpreting lung oscillometry results: Z-scores instead of fixed cut-off values?

Z-score is preferable to fixed cut-offs in the interpretation of respiratory oscillometry results We thank S. Salvi and co-workers for their interest in our original article [1], which analysed the characteristics and diagnostic performance of respiratory oscillometry in respiratory diseases. S. Salvi and co-workers proposed that fixed cut-off values, instead of Z-scores, should be used to differentiate between healthy and disease states.