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TABLE 7-3 Mean Vitamin D Intake and Mean Serum 25OHD Concentrations for the United States, 2005–2006, by Life Stage Groups

Life Stage Group (years)

Vitamin D Intake (IU/day)

Serum 25OHD Levels (nmol/L)

Food Alonea

Total Intakeb

Meanc

Adjusted for Sun Exposure (Reduced by 1/3)

Males

 

 

 

 

1–3

288 ± 8

364 ± 16

71.1 ± 2.0

47

4–8

256 ± 12

372 ± 16

70.5 ± 2.0

47

9–13

228 ± 8

300 ± 28

65.9 ± 2.2

44

14–18

244 ± 16

276 ± 20

60.1 ± 1.9

40

19–30

204 ± 12

264 ± 16

57.9 ± 2.0

38

31–50

216 ± 12

316 ± 12

58.5 ± 1.1

39

51–70

204 ± 12

352 ± 16

57.3 ± 1.8

38

> 70

224 ± 16

428 ± 28

58.9 ± 1.3

39

Females

 

 

 

 

1–3

276 ± 16

336 ± 16

71.4 ± 1.9

47

4–8

220 ± 12

316 ± 24

70.5 ± 2.1

47

9–13

212 ± 24

308 ± 40

59.1 ± 1.6

39

14–18

152 ± 8

200 ± 20

57.6 ± 1.9

38

19–30

144 ± 12

232 ± 12

62.7 ± 2.8

41

31–50

176 ± 12

308 ± 20

57.6 ± 1.7

38

51–70

156 ± 16

404 ± 40

57.2 ± 1.5

38

> 70

180 ± 8

400 ± 20

56.5 ± 1.8

37

NOTE: IU = International Units; SE = standard error.

aData are mean ± SE for foods only.

bData are mean ± SE for total intake: foods and dietary supplements.

cData are mean ± SE.

SOURCE: NHANES, 2005–2006; Bailey et al., 2010.

possible to adjust these data so as to roughly simulate a reduction in serum 25OHD levels consistent with the difference between the summer zenith and the winter nadir. Specifically, if the estimate that there is a one-third difference in serum 25OHD levels between the winter nadir and summer zenith as described in Chapter 3 is applied to this comparison, reducing these serum 25OHD levels by one-third results in a range of serum 25OHD levels from a low of 37 nmol/L (women > 70 years) to a high of 47 nmol/L (found in four life stage groups), which are still very close to, and in many cases above, a 40 nmol/L concentration consistent with an estimated average required intake. Given the observation made in Chapter 5 that the seasonal decline during the winter may differ between those with high and low initial baseline values, the correction applied using a 30 percent reduction may overestimate the decline in those at lower baseline 25OHD levels below 50 nmol/L. Moreover, this adjustment is excessive because for those



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