Table 3. Multivariable-adjusted change in PTH (95% CI) per 1 ng/ml change in 25(OH)D above and below 20 ng/ml in the population overall and stratified by race and ethnicity.
| Population | N | Δ PTH, pg/ml (95% CI)a | P value | N | Δ PTH, pg/ml (95% CI)a | P value |
|---|---|---|---|---|---|---|
| 25(OH)D ≤20 ng/ml | 25(OH)D >20 ng/ml | |||||
| All Participants | 3,903 | −0.80 (−1.00, −0.60) | <0.01 | 4,101 | −0.30 (−0.39, −0.22) | <0.01 |
| White | 1,203 | −0.85 (−1.15, −0.54) | <0.01 | 2,938 | −0.29 (−0.37, −0.21) | <0.01 |
| Mexican-American | 1,121 | −0.50 (−0.78, −0.22) | <0.01 | 802 | −0.52 (−0.71, −0.34) | <0.01 |
| Black | 1,579 | −0.90 (−1.28, −0.52) | <0.01 | 361 | 0.09 (−0.41, 0.59) | 0.71 |
a
Multivariable linear regression analyses, adjusted for age, gender, BMI, creatinine, calcium intake, and season of blood draw (either November 1 to April 30 or May 1 to October 31)