Table 2.
Results of the primary logistic regression model predicting adherence as determined by the novel serum 25(OH)D definition.
| Subject characteristic | N | Odd ratio | 95% confidence interval | P-value |
|---|---|---|---|---|
| Mean percent adherence (as measured by pill count) | 161 | 1.2* | (0.9, 1.6) | .29 |
| Maternal age | 161 | 1.0† | (1.0, 1.1) | .45 |
| Race | ||||
| Black | 32 | 1.8 | (0.6, 5.0) | .20 |
| Latina | 76 | 1.0 | (0.4, 2.3) | .41 |
| White | 53 | Referent | — | |
| Body mass index | 161 | 1.0‡ | (1.0, 1.1) | .22 |
| Dose | ||||
| 2000 IU | 85 | 0.5 | (0.2, 0.9) | .02 |
| 4000 IU | 76 | Referent | — | |
| Season at enrollment | ||||
| Spring | 53 | 0.7 | (0.3, 1.8) | .30 |
| Summer | 40 | 0.7 | (0.2, 1.8) | .24 |
| Fall | 34 | 1.7 | (0.6, 4.9) | .08 |
| Winter | 34 | Referent | — |
*Mean percent adherence was treated as a continuous measure in the model; however, this variable was coded such that the odds ratio reflects the increase in odds associated with a 10-percent increase in mean percent adherence.
†Maternal age at baseline was treated as a continuous measure in the model; however, this variable was coded such that the odds ratio reflects the increase in odds associated with a 1-year increase in age.
‡Body mass index was treated as a continuous measure in the model; however, this variable was coded such that the odds ratio reflects the increase in odds associated with a 1-unit increase in body mass index.