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TABLE I-6 Probabilities of Inadequate Iron Intakesa (mg/d) and Associated Ranges of Usual Intake in Adolescent Males and in Girls Using or Not Using Oral Contraceptives (OC), CSFII (1994–1996)

Probability of Inadequacy

9–13 y

14–18 y

 

Female

Male

Female

Male

Non-OC Users

OC Usersb

Mixed Populationc

1.0d

< 3.91

< 3.24

< 5.06

< 4.63

< 4.11

< 4.49

0.96

3.91–4.23

3.24–3.60

5.06–5.42

4.64–5.06

4.11–4.49

4.49–4.92

0.93

4.24–4.59

3.61–4.04

5.43–5.85

5.07–5.61

4.50–4.97

4.93–5.45

0.85

4.60–5.03

4.05–4.59

5.86–6.43

5.62–6.31

4.98–5.57

5.46–6.14

0.75

5.04–5.36

4.60–4.98

6.44–6.89

6.32–6.87

5.58–6.05

6.15–6.69

0.65

5.37–5.64

4.99–5.33

6.90–7.29

6.88–7.39

6.06–6.48

6.70–7.21

0.55

5.65–5.89

5.34–5.66

7.80–7.69

7.40–7.91

6.49–6.89

7.22–7.71

0.45

5.90–6.15

5.67–6.00

7.70–8.08

7.92–8.48

6.90–7.34

7.72–8.25

0.35

6.16–6.43

6.01–6.36

8.09–8.51

8.49–9.15

7.35–7.84

8.26–8.92

0.25

6.44–6.76

6.37–6.78

8.52–9.03

9.16–10.03

7.85–8.47

8.93–9.77

0.15

6.77–7.21

6.79–7.38

9.04–9.74

10.04–11.54

8.48–9.47

9.78–11.21

0.08

7.22–7.58

7.39–7.88

9.75–10.32

11.55–13.08

9.48–10.42

11.22–12.74

0.04

7.59–7.91

7.89–8.34

10.33–10.83

13.09–14.80

10.43–11.44

12.75–14.39

0d

> 7.91

> 8.34

> 10.83

> 14.80

> 11.44

> 14.39

aProbability of inadequate intake = probability that requirement is greater than the usual intake. May be used in simple computer programs to evaluate adjusted distributions of usual intakes. See Institute of Medicine. 2000. Dietary Reference Intakes: Applications in Dietary Assessment. Washington, DC: National Academy Press, for method of adjusting observed intake distributions. Not to be applied in the assessment of individuals. Derived from Tables I-3 and I-4.

bAssumes 60 percent reduction in menstrual iron loss.

cMixed population represents 17 percent oral contraceptive users and 83 percent nonoral contraceptive users (Abma JC, Chandra A, Mosher WD, Peterson LS, Piccinino LJ. 1997. Fertility, family planning, and women’s health: New data from the 1995 National Survey of Family Growth. Vital Health Stat 23:1–114).

dFor population assessment purposes, a probability of 1 has been assigned to all usual intakes falling below the two and one-half percentile of requirement and a probability of 0 has been assigned to all usual intakes falling above the ninety-seven and one-half percentile of requirement. This enables the assessment of population risk where precise estimates are impractical and effectively without impact.



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