Table 3. Correlation between vitamin D and laboratory measurements among studied groups.
| Vitamin D (ng/mL) | ||||
| Patients (n=40) | Controls (n=40) | |||
| *r | p | r | p | |
| Disease duration (year) | -0.68** | <0.001 | - | - |
| Total cholesterol level (mg/dL) | -0.45 | 0.003 | -0.87 | <0.001 |
| Triglycerides | -0.59 | <0.001 | -0.91 | <0.001 |
| High-density lipoproteins | 0.40 | 0.01 | 0.88 | <0.001 |
| Low-density lipoproteins | -0.77 | <0.001 | -0.89 | <0.001 |
| BASDAI | -0.69 | <0.001 | - | - |
| BASFI | -0.71 | <0.001 | - | - |
| BASMI | -0.41 | 0.008 | - | - |
| Visual analog scale | -0.62 | <0.001 | - | - |
| * Pearson correlation coefficient; ** Spearman correlation coefficient; BASDAI: Bath ankylosing spondylitis disease activity index; BASFI: Bath ankylosing spondylitis functional index; BASMI: Bath ankylosing spondylitis metrology index. | ||||