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Table 1 World Health Organization classification of obesity [20]

From: A review on the anesthetic management of obese patients undergoing surgery

Body mass index (kg.m2)

Classification

< 18.5

Underweight

18.5 – 24.9

Normal

25.0 – 29.9

Overweight

30.0 – 34.9

Obese Class 1

35.0 – 39.9

Obesity Class 2

> 40.0

Obese Class 3 (previously ‘morbid obesity’)