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| Country | Reference | 4x (%) | 6x (%) | 8x (%) | 10x (%) | Sample size |
|---|---|---|---|---|---|---|
| British Isles | Bailey and Wisskirchen, 2006 | 21 | 75 | 4 | 0 | 51 |
| Continental Europe (excluding Czech Republic) | Bailey and Wisskirchen, 2006 | 0 | 86.4 | 13.6 | 0 | 42 |
| Czech Republic | Mandák et al., 2003 | 2.1 | 92.5 | 5.3 | 0 | 94 |
| USA | Bailey, unpublished | 0 | 96.4 | 0 | 3.6 | 28 |
