BMI Prime is the ratio of a person's BMI to the upper limit of normal BMI (25 kg/m²). It expresses how overweight or underweight a person is relative to the healthy upper threshold. A BMI Prime of 1.00 means BMI = 25. Below 1.00 is underweight or normal; above 1.00 is overweight or obese.
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Pro Tip
BMI Prime makes cross-population comparisons easier. For populations where BMI cut-offs differ (e.g. Asian populations where 23 is considered overweight), BMI Prime can be recalculated against a different denominator.
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