Table 3. Cohort baseline characteristics.
| Cohort | Total | ASPS | ASPS-Fam | p* |
| N | 390 | 242 | 148 | |
| females, N (%) | 241 (61.8%) | 151 (62.4%) | 90 (60.8%) | 0.75 |
| age (years), median [IQR] | 69 [63-74] | 69 [64 - 75] | 68 [55 - 75] | 0.002 |
| education (years), median [IQR] | 10 [9-13] | 10 [9 - 10] | 10 [10 - 13] | 0.001 |
| hypertension, N (%) | 286 (73.3%) | 187 (77.3%) | 99 (66.9%) | 0.24 |
| diabetes, N (%) | 49 (12.6%) | 31 (12.8%) | 18 (12.2%) | 0.85 |
| atrial fibrillation, N (%) | 23 (5.9%) | 14 (5.8%) | 9 (6.1%) | 0.90 |
| 25(OH)D3 (nmol/L), median [IQR] | 58.8 [39.5 – 76.0] | 58.4 [37.9 - 77.9] | 59.5 [42.8 - 72.8] | 0.76 |
| 25(OH)D2 (nmol/L), median [IQR] | 1.6 [1.0 – 2.5] | 1.4 [0.9 - 1.9] | 2.2 [1.3 - 3.3] | 9.6 x 10-10 |
| total 25(OH)D (nmol/L), median [IQR] | 60.4 [42.2 – 78.5] | 59.7 [40.0 – 79.8] | 61.4 [46.1 – 75.2] | 0.56 |
| 24,25(OH)2D3 (nmol/L), median [IQR] | 3.1 [1.6 – 4.6] | 3.1 [1.5 – 4.8] | 3.2 [1.9 - 4.5] | 0.77 |
| VMR (%), median [IQR] | 5.2 [3.9 – 6.8] | 5.1 [3.7 - 6.8] | 5.4 [4.0 - 6.9] | 0.43 |
| blood samples: spring, N (%) | 118 (30.3%) | 51 (21.2%) | 67 (45.3%) | |
| blood samples: summer, N (%) | 110 (28.2%) | 76 (31.4%) | 34 (23.0%) | |
| blood samples: autumn, N (%) | 87 (22.3%) | 66 (28.3%) | 21 (14.2%) | |
| blood samples: winter, N (%) | 75 (19.2%) | 49 (20.2%) | 26 (17.6%) |
ASPS: Austrian Stroke Prevention Study; ASPS-Fam: Austrian Stroke Prevention Family Study; VMR: vitamin D metabolite ratio. *Chi-Square test was used to compare categorical variables and Mann-Whitney-U test was used to compare the non-normally distributed continuous variables between ASPS and ASPS-Fam.