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How is childhood and adolescent obesity measured?

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Body mass index (BMI) is a measure used to determine whether a child is overweight or obese. It is calculated using a child's weight and height. BMI does not measure body fat directly, but it is a reasonable indicator of body fatness for most children and teens.

A child's weight status is determined using an age- and sex-specific percentile for BMI rather than the BMI categories used for adults because children's body composition varies as they age and varies between boys and girls.

BMI calculator for adolescents