|
| No. of studied couples | Structural aberration | Total (%) | |||
| Rob | Rcp | Inv | Others | |||
| Belgium (Ghent) | 96 | 2 | 6 | - |
| 8 (8.3%) |
| France (Paris) | 315 | 5 | 7 | 4 |
| 16 (5.1%) |
| Italy (Padua) | 145 | 4 | 4 | 4 | 2 | 14 (9.6%) |
| Japan | 639 | 9 | 19 | 1 |
| 29 (4.5%) |
| Netherland (Leiden) | 67 | 3 | 5 | 1 |
| 9 (13.4%) |
| Netherland (Rotterdam) | 148 | 3 | 6 | 3 | 2 | 14 (9.6%) |
| Saudi Arabia (Riyadh) | 193 | 1 | 10 | 2 |
| 13 (6.7%) |
| Oman | 380 | 3 | 18 |
| 7 | 28 (5.5%) |