Table 3:
Predictors of 25(OH)D≤30 nmol/L at Visit 12 among women with 25(OH)D≤30 nmol/L at Visit 2
| Variable | Overall p value for covariate | Odds ratio (95% CI) |
|---|---|---|
| Age (years) | 0.763 | 0.98 (0.87-1.11) |
| BMI, kg/m2, mean (SD) | 0.425 | 1.02 (0.97-1.06) |
| Change in BMI (kg/m2/year) | 0.033 | 1.11 (1.01-1.23) |
| Race/ethnicity | ||
| Black (n=196) | 0.017 | Reference |
| White (n=75) | 0.27 (0.11-0.66) | |
| Chinese (n=25) | 0.42 (0.11-1.59) | |
| Hispanic (n=14) | 0.25 (0.04-1.46) | |
| Japanese (n=14) | Unable to calculate | |
| Household income | ||
| <$20,000 (n=52) | 0.203 | Reference |
| $20,000 to <$35,000 (n=50) | 2.06 (0.68-6.25) | |
| $35,000 to <$50,000 (n=59) | 1.71 (0.56-5.27) | |
| $50,000 to <$75,000 (n=67) | 0.69 (0.22-2.16) | |
| ≥$75,000 (n=75) | 1.01 (0.30-3.41) | |
| Educational attainment | ||
| Less than high school (n=12) | 0.367 | Reference |
| Completed high school or GED (n=67) | 0.35 (0.06-2.17) | |
| Some college (n=117) | 0.35 (0.06-2.08) | |
| College graduate (n=52) | 0.15 (0.02-1.10) | |
| Post-graduate education (n=73) | 0.29 (0.04-1.99) | |
| Vitamin use over observation period, n (%) | ||
| Neither V2 nor V12 (n=142) | <0.001 | Reference |
| Discontinued after V2 (n=32) | 1.63 (0.62-4.31) | |
| Initiated after V2 (n=114) | 0.22 (0.10-0.49) | |
| Both V2 and V12 (n=35) | 0.17 (0.05-0.66) | |
| Visit 12 season | ||
| Winter | 0.007 | Reference |
| Summer | 0.40 (0.21-0.78) |
25(OH)D, 25-hydroxyvitamin D; BMI, body mass index; GED, general education diploma. Note that no Japanese women had 25(OH)D≤30 nmol/L at Visit 12.