TABLE 1.
Serum 3-epi-25(OH)D3 and %3-epi-25(OH)D3 by quartile of serum 25(OH)D3 in adults aged 18–84 y (National Adult Nutrition Survey participants, n = 1082)1
| Quartiles of 25(OH)D3 concentration (nmol/L) |
||||
| <35.3 | ≥35.3–50.8 | ≥50.9–67.7 | ≥67.8 | |
| Participants, n | 269 | 272 | 270 | 271 |
| 3-epi-25(OH)D3, nmol/L | 1.22 ± 0.38a | 1.91 ± 0.64b | 2.69 ± 0.85c | 4.16 ± 1.66d |
| %3-epi-25(OH)D3 | 4.51 ± 1.26a | 4.46 ± 1.43a | 4.58 ± 1.40a | 4.97 ± 1.66b |
1
Values are means ± SDs. Means in a row without a common letter differ, P < 0.05 (Bonferroni’s test for post hoc comparison) and P < 0.0001 [1-factor ANOVA for both 3-epi-25(OH)D3 and %3-epi-25(OH)D3]. 25(OH)D3, 25-hydroxycholecalciferol; 3-epi-25(OH)D3, 3 epimer of 25-hydroxycholecalciferol; %3-epi-25(OH)D3, 3 epimer of 25-hydroxycholecalciferol as a percentage of 25-hydroxycholecalciferol.