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TABLE 12-6 Requirement for Absorbed Zinc for Adolescent Boys and Girls Aged 14 through 18 Years

 

Boys

Girls

Intestinal losses

34 μg/kg × 64 kg = 2,176 μg/day

34 μg/kg × 57 kg = 1,938 μg/day

Urinary and integumental losses

14 μg/kg × 64 kg = 896 μg/day

14 μg/kg × 57 kg = 798 μg/day

Semen or menstrual losses

100 μg/day

100 μg/day

Requirement for growth

10 g/day × 20μg/g = 200 μg

5 g/day × 20 μg/g = 100 μg/day

Required absorbed zinc

3,372 μg/day

2,936 μg/day

(see below), the EARs for adolescent boys and girls are calculated to be 8.5 and 7.3 mg/day of zinc, respectively.

Extrapolation from Adults. Based on the extrapolation method described in Chapter 2, the average requirement for adolescent boys and girls is 9.5 and 6.4 mg/day, respectively.

Zinc EAR and RDA Summary, Ages 14 through 18 Years

EAR for Boys

14–18 years

8.5 mg/day of zinc

EAR for Girls

14–18 years

7.3 mg/day of zinc

The RDA for zinc is set by using a CV of 10 percent (see Chapter 1) because information is not available on the standard deviation of the requirement. The RDA is defined as equal to the EAR plus twice the CV to cover the needs of 97 to 98 percent of the individuals in the group (therefore, the zinc RDA is 120 percent of the EAR). The calculated RDA is rounded up to the nearest 1 mg.

RDA for Boys

14–18 years

11 mg/day of zinc

RDA for Girls

14–18 years

9 mg/day of zinc



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