Baseline demographic status and comorbidity compared between comparison and VBI group
| Variable | VBI group n=3642 (%) | Comparison group n=14 568 (%) | p Value |
| Age, years (SD)* | 67.37 (13.82) | 65.41 (15.99) | 0.733 |
| <65 | 1362 (37.40) | 5.448 (37.40) | |
| ≥65 | 2280 (62.60) | 9120 (62.60) | |
| Sex | 0.999 | ||
| Female | 1794 (49.26) | 7176 (49.26) | |
| Male | 1848 (50.74) | 7392 (50.74) | |
| Comorbidity | |||
| Hypertension | 671 (18.42) | 2443 (16.77) | 0.153 |
| DM | 304 (8.35) | 1105 (7.59) | 0.298 |
| IHD | 204 (5.60) | 803 (5.51) | 0.742 |
| Hyperlipidaemia | 31 (0.85) | 94 (0.65) | 0.109 |
| TUD | 1 (0.03) | 8 (0.05) | 0.436 |
| Alcoholism | 0 (0) | 1 (0.01) | 0.800 |
| Obesity | 0 (0) | 0 (0) | – |
| AF | 27 (0.74) | 126 (0.86) | 0.276 |
| PD | 28 (0.77) | 87 (0.60) | 0.146 |
| CVA | 106 (2.91) | 471 (3.23) | 0.178 |
| Depression | 7 (0.19) | 16 (0.11) | 0.298 |
| CKD | 0 (0) | 0 (0) | – |
| CAI | 7 (0.19) | 36 (0.25) | 0.072 |
*t-test.
AF, atrial fibrillation; CAI, carotid artery insufficiency; CKD, chronic kidney disease; CVA, cerebral vascular accident; DM, diabetes mellitus; IHD, ischaemic heart disease; PD, Parkinson’s disease; TUD, tobacco use disorder; VBI, vertebrobasilar insufficiency.