Normal range
By convention, the normal range for whatever (a particular test, condition, symptom, behavior, etc.) is set to cover ninety-five percent (95%) of all values from the general population. Five percent (5%) of results consequently fall outside the normal range. Values that prove normal can therefore sometimes be outside the normal range. The normal range may differ depending on the patient’s age, size, sex, or ethnic background.

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range of normal see reference values, under value.

Medical dictionary. 2011.

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