| Country | Variance in maturity classification score* | Maturity classification scores (based on quartiles) | |||
| Min score | Max score | Most mature (⩽25%) | Intermediate maturity (>25%–75%) | Least mature(>75%) | |
| Belgium (n = 24) | 2.10 | 3.10 | 3 | 16 | 5 |
| Czech Republic (n = 38) | 1.50 | 3.00 | 10 | 22 | 8 |
| France (n = 65) | 1.87 | 3.25 | 11 | 32 | 22 |
| Ireland (n = 23) | 1.90 | 3.08 | 8 | 12 | 3 |
| The Netherlands (n = 8) | 2.09 | 2.52 | 4 | 4 | – |
| Poland (n = 76) | 1.86 | 3.45 | 22 | 33 | 21 |
| Spain (n = 105) | 1.70 | 3.26 | 20 | 55 | 30 |
| UK (n = 10) | 1.77 | 2.37 | 9 | 1 | – |
| Total (n = 349) | 1.50 | 3.45 | 87 | 175 | 87 |
*Low scores reflect higher maturity.