Table 3 Distribution of the use of oral vitamin B12-containing supplements and concomitant serum B12 concentrations
From: Relationship between serum B12 concentrations and mortality: experience in NHANES
Vitamin B12 supplements | Number | Serum B12 (pmol/l) | Serum B12 < 140 | Serum B12 > 1000 | ||
|---|---|---|---|---|---|---|
Median (IQR) | Minimum | Maximum | ||||
No supplements | 16,385 | 321 (242–423) | 10.5 | 148,936 | 488 (3.0%) | 211 (1.3%) |
0–4.9 mcg | 1115 | 345 (258–458) | 75.3 | 9810 | 22 (2.0%) | 19 (1.7%) |
5–24.9 mcg | 3358 | 391 (294–523) | 25.1 | 75,645 | 47 (1.4%) | 83 (2.5%) |
25–99 mcg | 1774 | 428 (321–564) | 36.9 | 4794 | 24 (1.4) | 61 (3.4%) |
100–999 mcg | 780 | 502 (373–696) | 86.4 | 7557 | 4 (0.5%) | 80 (10.3%) |
> 1000 mcg | 387 | 732 (495–1198) | 103 | 8576 | 3 (0.8%) | 125 (32.3%) |
Unknown | 463 | 377 (280–548) | 34.7 | 33,837 | 6 (1.3%) | 26 (5.6%) |