Zero Error NegativeZero Error causes an steady increase in the volume resulting in a lower FVC (2.90 L) and percent predicted FVC (71%). There is less of an error on the FEV1. Notice the FEV1 is larger than the FVC which never should happen.

Zero Error causes a steady decrease in the volume resulting in a lower FVC (3.45 L) and percent predicted FVC (79%). There is less of an effect on the FEV1.

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