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Table 3: Prevalence of Vitamin B12 Serum Levels for the U.S. Population by Age, National Health and Nutrition Examination Survey 2001-2004.


Vitamin B12
Serum Level
9-13 years of age14-18 years of age19-30 years of age31-50 years of age≥ 51 years of age
≤ 150 pg/mL00.2%0.2%0.5%1.2%
151-200 pg/mL0.1%0.6%1.5%1.0%2.0%
201-250 pg/mL0.6%2.5%5.2%6.1%5.1%
251-300 pg/mL1.6%5.4%7.9%6.9%6.2%
301-350 pg/mL4.2%9.4%11.3%10.7%8.9%
351-400 pg/mL5.4%9.2%13.1%13.5%10.7%
> 400 pg/mL88.0%72.7%60.8%61.2%65.8%

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