Table 4. Comparison of mean HbA1c and fasting glucose according to PTH quartiles.
| PTH level | Model 1 | Model 2 | Model 3 | |
|---|---|---|---|---|
| Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | ||
| Fasting glucose (mg/dL) | Quartile 1 | 146.7(142.0–151.4) | 146.2 (141.6–150.9) | 146.2 (141.6–150.9) |
| Quartile 2 | 144.0(139.3–148.6) | 144.0 (139.4–148.7) | 144.0 (139.4–148.7) | |
| Quartile 3 | 145.5(140.9–150.1) | 147.1 (142.5–151.7) | 147.1 (142.5–151.7) | |
| Quartile 4 | 138.5(133.8–143.2) | 139.2 (134.6–143.9) | 139.2 (134.6–143.9) | |
| p for trend | 0.033 | 0.092 | 0.104 | |
| p for between groups | 0.080 | 0.080 | 0.088 | |
| Hemoglobin A1c (%) | Quartile 1 | 7.39(7.24–7.55)* | 7.32 (7.16–7.47) | 7.35 (7.19–7.51)* |
| Quartile 2 | 7.32(7.17–7.48) | 7.35 (7.19–7.50) | 7.34 (7.19–7.50) | |
| Quartile 3 | 7.21(7.05–7.36) | 7.28 (7.13–7.43) | 7.28 (7.13–7.43) | |
| Quartile 4 | 7.08(6.92–7.23) | 7.12 (6.97–7.27) | 7.09 (6.94–7.24) | |
| p for trend | 0.003 | 0.067 | 0.022 | |
| p for between groups | 0.021 | 0.124 | 0.048 |
Model 1, Adjusted by month of blood collection, sex and age
Model 2, Adjusted by Model 1 plus BMI, smoking, physical activity, hypertension medications, diabetic duration, total cholesterol, triglyceride and HDL cholesterol
Model 3, Adjusted by Model 2 plus log-25(OH)D
*p<0.005 compared with Quartile 4 with the Bonferroni adjustment for multiple comparison