Waist-to-height
WHtR ~0.5 cut-off.
When to use: Metabolic risk and shape without % fat; complements waist and BMI, does not replace Navy.
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waist ÷ height
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Estimate, not medical advice.
WHtR
Waist ÷ height. Often ~0.5 cut-off: above suggests higher metabolic risk regardless of BMI.