Body Mass Index

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Body mass index is determined by div iding the person's weight in kilograms by their height in meters squared. The formula for BMI is:

AGE IN MONTHS

SO 55 60 65 70 75 80 85 90 95 TOO 105 110 LENGTH IN CM

Figure 2-10. Top. head circumference by age percentiles for boys (birth to 36 months). Bottom, weight by length percentiles for boys (birth to 36 months).

BM1 correlates well with adiposity in adults and because of its relativ e ease and accuracy of basic measures, is recommended for use in screening for obesity in adults. In the pediatric population use of BMI is still being evaluated. It is recommended that percentiles be used rather than an absolute number because this value changes throughout periods of growth.4 ' Currently, a BMI at or above the 95th percentile for age and sex. using the NCHS growth data, indicates need tor evaluation and treatment

Nchs Percentiles For Children

S5 90 95 100 105 110 115 120 125 130 135 140 145 STATURE !N CM

Figure 2-11. Weight by stature percentiles for prepubescent girls.

S5 90 95 100 105 110 115 120 125 130 135 140 145 STATURE !N CM

Figure 2-11. Weight by stature percentiles for prepubescent girls.

for obesity. A BMI at the 95th percentile may range from 18 to 30 depending on the age and sex of the child.4-7

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