en is slightly below fifth percentile of intake, 593 mg (19.1 mmol)/day, based on the 1994 CSFII data.

Determination of the RDA: Ages 19 through 30 and 31 through 50 Years

The variance in requirements cannot be determined from the available data. Thus, a CV of 10 percent (1 SD) is assumed, resulting in an RDA of 700 mg (22.6 mmol)/day.

RDA for Men

19 through 30 years

700 mg (22.6 mmol)/day

 

31 through 50 years

700 mg (22.6 mmol)/day

RDA for Women

19 through 30 years

700 mg (22.6 mmol)/day

 

31 through 50 years

700 mg (22.6 mmol)/day

Ages 51 through 70 and > 70 Years

The data on which the foregoing phosphorus analyses were based were derived from adults of mixed ages, including 51 through 70 and > 70 years. Data specific to these ages are not available. Intestinal absorption efficiency for phosphorus is not known to change appreciably with age, and as noted above, changes in the renal clearance of phosphorus are not sufficient to alter the curve of Figure 5-1 until GFR is reduced by approximately 80 percent. Hence, it is reasonable to adopt the same phosphorus EAR for older adults as for younger adults.

EAR Summary: Ages 51 through 70 and > 70 Years

The EAR for both men and women ages 51 years and older is set at 580 mg (18.7 mmol)/day.

EAR for Men

51 through 70 years

580 mg (18.7 mmol)/day

 

> 70 years

580 mg (18.7 mmol)/day

EAR for Women

51 through 70 years

580 mg (18.7 mmol)/day

 

> 70 years

580 mg (18.7 mmol)/day

Utilizing the 1994 CSFII intake data, adjusted for day-to-day variations (Nusser et al., 1996), the median phosphorus intake for men, aged 51 through 70 years, is 1,274 mg (41.1 mmol)/day (see Appendix D). All of the men, aged 51 through 70 years, had phosphorus intakes in amounts above the EAR. The median intake for men,



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