Table 1.
Baseline Characteristics of the Patients According to Vitamin D Level
| Characteristic | Vitamin D Level |
|||
|---|---|---|---|---|
| <15 ng/mL | 15 to <30 ng/mL | >=30 ng/mL | p-value | |
| Age | 72.1 ± 11.0 | 65.6 ± 14.5 | 66.2 ± 15.4 | 0.315 |
| % Female | 53.8% | 47.9% | 37.4% | 0.228 |
| % Smokers | 23.1% | 27.9% | 26.4% | 0.919 |
| % Diabetic | 23.1% | 10.0% | 13.2% | 0.340 |
| Systolic Blood Pressure (mmHg) | 137.1 ± 17.0 | 134.5 ± 18.0 | 138.3 ± 20.8 | 0.331 |
| Body Mass Index (kg/m2) | 26.5 ± 6.3 | 28.1 ± 6.0 | 27.4 ± 5.6 | 0.520 |
| Cholesterol (total:HDL) | 4.7 ± 1.6 | 5.1 ± 1.5 | 5.1 ± 1.4 | 0.514 |
| % Previous IHD | 69.2% | 55.7% | 62.6% | 0.434 |
| % Previous stroke | 15.4% | 17.1% | 15.4% | 0.936 |
| % Previous PVD | 41.7% | 45.7% | 34.1% | 0.215 |
| Season (quarter of plasma collection) | 0.492 | |||
| January 1 – March 31 | 23.1% | 11.4% | 6.6% | 0.146 |
| April 1 – June 30 | 53.8% | 53.6% | 50.6% | 0.900 |
| July 1 – September 30 | 7.7% | 16.4% | 33.0% | *0.005 |
| October 1 – December 31 | 15.4% | 18.6% | 9.9% | 0.201 |