Radiological findings by age groups
| ≤ 30 years | 31–44 years | 45–59 years | ≥ 60 years | |
| Sex (males/females) | 23/9 | 25/9 | 26/10 | 21/17 |
| Subjects (n) (%) | ||||
| One or more occluded L1–L4 lumbar arteries | 1 (3) | 3 (8) | 3 (8) | 8 (21) |
| One or more narrowed L1–L4 lumbar arteries* | 1 (3) | 2 (6) | 5 (14) | 7 (18) |
| Occluded middle sacral artery | 1 (3) | 3 (9) | 4 (11) | 13 (34) |
| Narrowed middle sacral artery | 4 (12) | 12 (35) | 14 (39) | 10 (26) |
| Any occluded/narrowed L1–L4 lumbar and/or middle sacral artery | 7 (22) | 17 (50) | 25 (69) | 31 (82) |
| Major collateral arteries | 7 (12) | 15 (44) | 18 (50) | 27 (71) |
2-151 Excluding those with occluded arteries.