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 age | 14-18 years of age | 19-30 years of age | 31-50 years of age | ≥ 51 years of age |
|---|---|---|---|---|---|
| ≤ 150 pg/mL | 0 | 0.2% | 0.2% | 0.5% | 1.2% |
| 151-200 pg/mL | 0.1% | 0.6% | 1.5% | 1.0% | 2.0% |
| 201-250 pg/mL | 0.6% | 2.5% | 5.2% | 6.1% | 5.1% |
| 251-300 pg/mL | 1.6% | 5.4% | 7.9% | 6.9% | 6.2% |
| 301-350 pg/mL | 4.2% | 9.4% | 11.3% | 10.7% | 8.9% |
| 351-400 pg/mL | 5.4% | 9.2% | 13.1% | 13.5% | 10.7% |
| > 400 pg/mL | 88.0% | 72.7% | 60.8% | 61.2% | 65.8% |
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