Table 1.
Characteristics of Enrolled Subjects
| 200 IU (n=25) |
1000 IU (n=29) |
p value | |
|---|---|---|---|
| Age (y) | 16.1 ± 2.2 | 16.1 ± 2.2 | 0.99 |
| Gender | 0.13 | ||
| Male | 4 (16) | 11 (38) | |
| Female | 21 (84) | 18 (62) | |
| Ethnicity | 0.74 | ||
| Hispanic | 4 (16) | 6 (21) | |
| Non-Hispanic | 21 (84) | 23 (79) | |
| Race | 0.80 | ||
| Caucasian | 10 (40) | 14 (48) | |
| African American | 4 (16) | 4 (14) | |
| Asian | 6 (24) | 4 (14) | |
| Other | 5 (20) | 7 (24) | |
| BMI (kg/m2) | 21.3 ± 2.8 | 21.5 ± 3.5 | 0.78 |
| BMI percentile (%) | 53.7 ± 28.1 | 55.4 ± 30.1 | 0.83 |
| Dietary Ca intake (mg/d) | 977 ± 487 | 930 ± 305 | 0.68 |
| Dietary Vitamin D intake (IU/d) | 160 ± 128 | 187 ± 119 | 0.43 |
| Prior vitamin D supplement use | |||
| High dose vitamin D2 treatment | 3 (12) | 10 (34) | 0.065 |
| OTC vitamin use | 9 (26) | 14 (48) | 0.42 |
| Compliance (% doses taken) | 84 ± 20 | 81 ± 28 | 0.69 |
| Season of enrollment | 0.60 | ||
| Fall | 14 (56) | 14 (56) | |
| Winter | 11 (44) | 15 (51) | |
Continuous measures are expressed as mean ± SD and compared by t-test. Discrete variables are expressed as n (%) and compared by Fisher exact test.