CareFusion Micro I, Operating Manual

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Use the down arrow to see further indices, if configured, and the
best results from a sequence of blows:
At any time when the results are displayed another spirometer test
may be performed by touching the enter key. If the enter key is
touched accidently then simply press the back key to return to the
results screen.
The Micro I may be configured to display the Z score instead of the
percentage of predicted values where data from the predicted value
sets are available:
The Z score is the number of standard deviations that the results are
above (positive Z score) or below (negative Z score) the predicted
value.