Table 3.
Logistic Regression Modelinga of Associations Between Vitamin D and Odds of COPD Exacerbation in the Year Before Enrollment
| Odds of COPD Exacerbation in Prior Year (Continuous Vitamin D) |
Odds of COPD Exacerbation in Prior Year (Vitamin D Deficiency Status) |
|||||
|---|---|---|---|---|---|---|
| OR | 95% CI | P Value | OR | 95% CI | P Value | |
| 25-OH-vitamin D (per 10-ng/mL decrease) | 1.11 | 1.01-1.22 | .04 | … | … | … |
| 25-OH-vitamin D (< 20 vs ≥ 20 ng/mL) | … | … | … | 1.32 | 1.00-1.74 | .049 |
| Age (per 10 y) | 0.60 | 0.52-0.71 | < .001 | 0.60 | 0.54-0.74 | < .001 |
| Sex, female | 1.73 | 1.38-2.16 | < .001 | 1.67 | 1.34-2.10 | < .001 |
| Race, black | 1.28 | 0.93-1.77 | .09 | 1.28 | 0.93-1.77 | .09 |
| Current smoking | 0.49 | 0.37-0.63 | < .001 | 0.48 | 0.37-0.63 | < .001 |
| Pack-years smoked (per 10 pack-years) | 0.97 | 0.93-1.02 | .19 | 0.97 | 0.93-1.02 | .19 |
| Season of blood draw | ||||||
| Spring | 0.89 | 0.65-1.23 | .96 | 0.88 | 0.64-1.21 | .63 |
| Summer | 0.91 | 0.66-1.26 | .99 | 0.91 | 0.66-1.26 | .91 |
| Fall | 0.90 | 0.65-1.25 | .97 | 0.90 | 0.65-1.25 | .81 |
| Winter | (ref) | … | … | (ref) | … | … |
a
Adjusted for all covariates in table. See Table 2 legend for expansion of abbreviation.