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The NHS says to keep your waist under half your height and use the ratio alongside BMI; NICE says a waist over half your height signals greater risk. At 170 cm the line is 85 cm.

The same 25.5 is obesity class I in Korea and merely overweight to the WHO. Whose ruler you used comes first.

Three official tables side by side — Korea's NHIS, the WHO and the CDC. Two bands disagree, and that gap is the whole puzzle.