Table 1. Classification of nutritional status according to age group(4,6,7,9,15,18,19).

Nutritional status	Infants <2 years*	Children and adolescents 2 to 18 years†	Adults
Optimal	W/H ≥p50 W/A ≥p50 H/A ≥p50 (z-score ≥0)	BMI p50-p85 (z-score 0 – z-score +1) 2-5 years W/H ≥p10 (z-score ≥-1.28)	Women: BMI 22-25kg/m2 Men: BMI 23-25kg/m2
Eutrophic	W/H p25-p50 (z-score 0.67 – z-score 0)	BMI p25-p50 (z-score 0.67 – z-score 0) 2-5 years W/H ≥p10 With no recent loss of weight	Women: BMI 20-22kg/m2 Men: BMI 20-23kg/m2 With no recent non-intentional weight loss
Nutritional risk	W/H p10-p25 (z-score 1.28 – z-score 0.67)	BMI p10-p25 Weight loss or plateau in 2 to 4 months	BMI 18.5-20kg/m2 and/or ≥5% non-intentional weight loss over the last 2 months
Malnutrition	W/H <p10 (z-score <-1.28) H/A <p5 and/or drop of 2 percentiles in growth	BMI < p10 (z-score <-1.28) and/or drop of 2 percentiles in weight and inflection of growth	BMI <18.5kg/m2 On-going weight loss (>5%)
Overweight		BMI p85-p97 (z-score +1 – z-score +2)	BMI 25-30kg/m2
Obesity		BMI >97 (>z-score +2)	BMI >30kg/m2

* Consider W/H preferably to BMI/A in infants; ^† in all nutritional classifications of children and adolescents, the H/A indicator should be considered based on genetic potential (H/A ≥genetic potential).^(4,15)

W: weight; H: height; A: age; BMI: body mass index.