Table 2.
Baseline characteristics by race
| All Children | Black | White | P value | |
|---|---|---|---|---|
|
N=96 N (%) or mean±SD or median (25th-75th quartile) |
N=52 N (%) or mean±SD or median (25th-75th quartile) |
N=44 N (%) or mean±SD or median (25th-75th quartile) |
Black vs. White difference | |
| Demographic | ||||
| Male | 50 (52) | 27 (51.9) | 23 (52.3) | 0.97 |
| Age (years) | 11.4±1.9 | 11.7±1.9 | 11±1.8 | 0.053 |
| Weight (kg) | 44.5 (36.3-59.1) | 49.60 (39.2-64.1) | 40.3 (33.4-54.2) | 0.005 |
| Height (cm) | 149.2±12.8 | 151.8±12.8 | 146.2±12.1 | 0.034 |
| BMI (kg/m2) | 20.4 (17.8-23.6) | 21.8 (18-27.1) | 19.7 (17.0-22.1) | 0.019 |
| Tanner stage | ||||
| Tanner I (prepubertal) | 36 (37.5) | 15 (28.8) | 21 (47.7) | 0.006 |
| Tanner II & III (early & mid pubertal) | 40 (41.7) | 20 (38.5) | 20 (45.5) | |
| Tanner IV & V (late pubertal) | 20 (20.8) | 17 (32.7) | 3 (6.8) | |
| Skin Type | ||||
| I, II, & III (Light-skinned) | 43 (45.3) | 6 (11.8) | 37 (84.1) | <0.0001 |
| IV & V (Dark-skinned) | 52 (54.7) | 45 (88.2) | 7 (15.9) | |
| Melanin index | ||||
| Forehead | 49.9 (35.2-73.1) | 73.1 (59.0-82.0) | 35.2 (33.7-38.6) | <0.0001 |
| Laboratory data | ||||
| Calcium (mg/dL) | 9.6 (9.4-10.0) | 9.8 (9.5-10.2) | 9.6 (9.4-9.8) | 0.001 |
| Phosphorus (mg/dL) | 5.0±0.5 | 5.0±0.6 | 5.1±0.5 | 0.17 |
| Albumin (g/dL) | 4.2±0.3 | 4.3±0.3 | 4.2±0.2 | 0.064 |
| 25(OH)D (ng/mL) | 19.9±7.7 | 17.0±7.4 | 23.4±6.5 | <0.0001 |
| Dietary intake | ||||
| Calcium (mg/day) | 984 (694-1580) | 943 (597-1640) | 1029 (773-1554) | 0.32 |
| Vitamin D (IU/day) | 200 (132-400) | 192 (125-362) | 234 (149-403) | 0.14 |
| Treatment arm | ||||
| Placebo | 45 (46.9) | 24 (46.2) | 21 (47.7) | 0.88 |