Micro Direct Micro I Operating Manual page 18

When a sequence of blows is recorded, the results and the quality
check refer to the current blow but the interpretation is based upon
the best result of the sequence.
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, 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.
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