What is a good number on a spirometer?

What is a good number on a spirometer?

Med-Tech & Design Associates International offers the NDD Easyone Air spirometer that provides test results of a healthy FEV1% for adults over 70%, while providing test results of a healthy FEV1% for children is between 80-85%.

https://4medtech.com/shop/spirometers/easyone-air-3/

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