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Thiamin

Riboflavin

Niacin

B6

How are problems with methods addressed in the report?

Not necessary

Earlier under-and over-estimations of flavins noted.

Questions for research

Not necessary

a Gunter EW, Bowman BA, Caudill SP, Twite DB, Adams MJ, Sampson EJ. 1996. Results of an international round robin for serum and whole-blood folate. Clin Chem 42:1689–1694.

TABLE E-2 Methodologic Problems with Obtaining Food Composition Data for B Vitamins

 

Thiamin

Riboflavin

Niacin

B6

Are precise, accurate methods available?a

Substantial, acceptable quality

Substantial, acceptable quality

Substantial, acceptable quality

Substantial, acceptable quality

Is there good agreement in results using different methods?

Fair when allowance is made for specificity differences

Over time, how have changes in methods affected estimates?

None noted

About the same or slightly lower

None noted

Slightly higher now

a Ratings for the B vitamins (but not for choline) are taken from Life Sciences Research Office/Federation of American Societies for Experimental Biology. 1995. Third Report on Nutrition Monitoring in the United States. Washington, DC: U.S. Government Printing Office.

b Quality of data was rated moot if it was considered unlikely that improved data for that food component would make a difference in the assessment of nutrition-related health status and the assignment of nutrition monitoring priority status (LSRO/FASEB, 1995).



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