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basis for EAR values that are different during these life stages than they are for other women of comparable age.

Reference Weights and Heights

The reference weights and heights selected for children and adults are shown in Table 1-1. The values are based on anthropometric data collected from 1988–1994 as part of the Third National Health and Nutrition Examination Survey (NHANES III) in the United States. When extrapolation to a different age group was conducted, these reference weights were used, except for iron which used weights with known coefficients of variation that were required for factorial modeling.

Using NHANES III data, the median heights for the life stage and gender groups through age 30 years were identified, and the median weights for these heights were based on reported median Body Mass Index (BMI) for the same individuals. Since there is no evidence that weight should change as adults age if activity is maintained, the reference weights for adults ages 19 through 30 years are applied to all adult age groups.

The most recent nationally representative data available for Canadians (from the 1970–1972 Nutrition Canada Survey [Demirjian, 1980]) were reviewed. In general, median heights of children from

TABLE 1-1 Reference Heights and Weights for Children and Adults in the United Statesa

Gender

Age

Median Body Mass Index (kg/m2)

Reference Height, cm (in)

Reference Weightb kg (lb)

Male, female

2–6 mo

64 (25)

7 (16)

 

7–11 mo

72 (28)

9 (20)

 

1–3 y

91 (36)

13 (29)

 

4–8 y

15.8

118 (46)

22 (48)

Male

9–13 y

18.5

147 (58)

40 (88)

 

14–18 y

21.3

174 (68)

64 (142)

 

19–30 y

24.4

176 (69)

76 (166)

Female

9–13 y

18.3

148 (58)

40 (88)

 

14–18 y

21.3

163 (64)

57 (125)

 

19–30 y

22.8

163 (64)

61 (133)

a Adapted from the Third National Health and Nutrition Examination Survey (NHANES III), 1988–1994.

b Calculated from body mass index and height for ages 4 through 8 years and older.



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