Table 1.

Classification of BMI levels and risk of comorbidities based on BMI and WC values using data analysis of a large, nationally representative cohort of Korean adults5

Classification*	BMI (kg/m2)	Risk of comorbidity
		WC <90 cm in men <85 cm in women	WC ≥90 cm in men ≥85 cm in women
Underweight	<18.5	Low	Moderate
Normal	18.5–22.9	Moderate	Slightly high
Pre-obese	23–24.9	Slightly high	High
Class I obesity	25–29.9	High	Very high
Class II obesity	30–34.9	Very high	Highest
Class III obesity	≥35	Highest	Highest

^*Pre-obese can be referred to as overweight and class III obesity as severe obesity.

BMI, body mass index; WC, waist circumference.