Vein of Trolard diameter
| Authors | Mean vein of Trolard diameter, mm | Range, mm | SD, mm |
| Oka et al., 198528 | 3.3 | 2–5 | ns |
| Santos Silva et al, 2014 | 3.32 | 1.25–8.28 | 0.11 |
| Naidoo et al, 202221 | 2.14 (single occurrence) | ns | 0.472 |
| 2.19 (double occurrence) | ns | 0.604 | |
| 1.63 (triple occurrence) | ns | ns | |
| Karatas et al, 202323 | 4.4 (right) | ns | ns |
| 3.8 (left) | ns | ns |
Note: Reported diameter, with relevant measure of variability provided (no standard across studies was used).
ns, not specified.