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What are Predicted Values?
You should be familiar with a "normal temperature" or a normal "blood sugar" value. However, in lung function testing, there is no single "normal" value.
Each patient has an expected "normal" value that is called a "predicted" value. That means, a person of a particular ethnic origin, sex, age and height should have a particular vital capacity and FEV1.
This is read off from tables compiled after studying hundreds of normal persons. Thus, a hispanic man of 30 years and a height of 5ft 8 in would have a "predicted" or expected vital capacity quite different from a hispanic man of 5ft 6 in.