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. 2018 Apr 5;136(5):548–552. doi: 10.1001/jamaophthalmol.2018.0642

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.

a

Adjusted for geographic region and month of laboratory blood draw.

b

Asian and unknown categories were not run owing to small sample sizes.