Table 3. Unadjusted and Adjusted Logistic Regression Results.
Variable | No. of Patients | Odds Ratio (95% CI) | P Value |
---|---|---|---|
Unadjusted logistic regression | |||
Vitamin D level | |||
<20 ng/dL | 587 | 1 [Reference] | .03 |
≥20 ng/dL | 2761 | 0.78 (0.62-0.98) | |
Adjusted logistic regressiona | |||
Vitamin D level | |||
<20 ng/dL | 587 | 1 [Reference] | .04 |
≥20 ng/dL | 2761 | 0.79 (0.62-0.99) | |
Vitamin D blood draw month | |||
April-October | 1864 | 1 [Reference] | .39 |
November-March | 1484 | 1.08 (0.90-1.30) | |
Geographic region | |||
Northeast | 713 | 1 [Reference] | .18 |
Southeast | 1903 | 1.31 (1.02-1.67) | |
West | 717 | 1.16 (0.86-1.56) | |
Unknown | 9 | 0.91 (0.20-4.11) | |
Adjusted race/ethnicity–stratified logistic regressiona,b | |||
Vitamin D level in white patients | |||
<20 ng/dL | 265 | 1 [Reference] | .40 |
≥20 ng/dL | 1757 | 0.87 (0.62-1.47) | |
Vitamin D level in black patients | |||
<20 ng/dL | 150 | 1 [Reference] | .004 |
≥20 ng/dL | 402 | 0.49 (0.30-0.80) | |
Vitamin D level in Hispanic patients | |||
<20 ng/dL | 51 | 1 [Reference] | .10 |
≥20 ng/dL | 111 | 0.60 (0.33-1.10) |
SI conversion factor: To convert vitamin D to nanomoles per liter, multiply by 2.496.
Adjusted for geographic region and month of laboratory blood draw.
Asian and unknown categories were not run owing to small sample sizes.