TABLE 2.
Baseline serum 25(OH)D concentration by race and BMI
| Race category | n (%) | Mean serum 25(OH)D, ng/mL ± SD1 | Vitamin D categories, n (%) |
|||
|---|---|---|---|---|---|---|
| < 20 ng/mL (<50 nmol/L) | 20 to <30 ng/mL (50-74 nmol/L) | 30 to <40 ng/mL (75-99 nmol/L) | ≥ 40 ng/mL (≥100 nmol/L) | |||
| Asian | 130 | 42 (32.3) | 43 (33.1) | 32 (24.6) | 13 (10.0)2 | |
| 25.9 ± 10.23 | 15.1 ± 3.4 | 24.7 ± 2.8 | 33.8 ± 3.0 | 45.2 ± 6.8 | ||
| BMI4, kg/m2 | ||||||
| <25 | 22 (16.9) | 27.8 ± 7.2 | 5 (22.7) | 7 (31.8) | 9 (40.9) | 1 (4.6) |
| 25 to <30 | 69 (53.1) | 26.1 ± 9.4 | 21 (30.4) | 22 (31.9) | 20 (29.0) | 6 (4.6) |
| 30 to <35 | 31 (23.9) | 24.8 ± 14.1 | 14 (45.2) | 9 (29.0) | 2 (6.5) | 6 (19.4) |
| ≥35 | 8 (6.2) | 23.8 ± 5.5 | 2 (25.0) | 5 (62.5) | 1 (12.5) | 0 (0) |
| Black | 616 | 239 (38.8) | 206 (33.4) | 116 (18.8) | 55 (8.9)2 | |
| 24.2 ± 10.93 | 14.1 ± 3.6 | 24.4 ± 2.8 | 34.0 ± 2.7 | 46.8 ± 7.9 | ||
| BMI4, kg/m2 | ||||||
| <30 | 182 (29.5) | 26.3 ± 11.8 | 64 (35.2) | 53 (29.1) | 42 (23.1) | 23 (12.6) |
| 30 to <35 | 243 (39.4) | 24.3 ± 10.6 | 87 (35.8) | 90 (37.0) | 45 (18.5) | 21 (8.6) |
| 35 to <40 | 149 (24.2) | 22.1 ± 10.1 | 66 (44.3) | 51 (34.2) | 23 (15.4) | 9 (6.0) |
| ≥40 | 42 (6.8) | 22.0 ± 8.8 | 22 (52.4) | 12 (28.6) | 6 (14.3) | 2 (4.8) |
| White | 1616 | 230 (14.2) | 605 (37.5) | 562 (34.8) | 218 (13.5)2 | |
| 29.6 ± 9.53 | 15.4 ± 3.1 | 25.1 ± 2.9 | 34.1 ± 2.9 | 45.7 ± 6.0 | ||
| BMI4, kg/m2 | ||||||
| <30 | 568 (35.2) | 31.6 ± 9.9 | 63 (11.1) | 185 (32.6) | 214 (37.7) | 106 (18.7) |
| 30 to <35 | 614 (38.0) | 29.4 ± 9.2 | 77 (12.6) | 251 (41.0) | 213 (34.8) | 72 (11.8) |
| 35 to <40 | 348 (21.5) | 27.9 ± 8.9 | 62 (17.8) | 137 (39.4) | 114 (32.8) | 35 (10.1) |
| ≥40 | 86 (5.3) | 24.9 ± 8.4 | 28 (32.6) | 32 (37.2) | 21 (24.4) | 5 (5.8) |
Plus or minus values are mean ± SD. Percentages may not add up to 100 because of rounding off.
Row percentages add up to 100.
1
To convert 25-hydroxyvitamin D from ng/mL to nmol/L, multiply by 2.496.
2
Chi-squared test comparing % of participants of each race group with baseline 25(OH)D ≥ 40 ng/L, P < 0.01.
3
ANOVA test comparing baseline mean 25(OH)D concentrations between all 3 race groups, P < 0.001.
4
Ordinary least square regression P < 0.001, significant overall trend pf 25(OH)D concentrations for weight groups adjusted for race.1