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Adults aged 18–84 y with serum total 25(OH)D below various thresholds, with and without inclusion of serum 3-epi-25(OH)D3 (National Adult Nutrition Survey participants, n = 1082)1
| Threshold (nmol/L) | Without 3-epi-25(OH)D3 | With 3-epi-25(OH)D3 |
| % | % | |
| <20 | 2.9 | 2.1 |
| <30 | 12.5 | 10.8 |
| <40 | 29.1 | 26.2 |
| <50 | 45.8 | 43.0 |
| <60 | 61.9 | 57.7 |
| <70 | 75.2 | 71.6 |
| <75 | 81.0 | 77.4 |
| >125 | 3.4 | 5.5 |
25(OH)D, 25-hydroxyvitamin D; 3-epi-25(OH)D3, 3 epimer of 25-hydroxycholecalciferol.
