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Age groups: definitions and numbers of individuals of the sample
| Age groups (mean age, years) | Definition | No. of females | No. of males | Total |
|---|---|---|---|---|
| G1 (2.1) | 1.75–3.5 years | 8 | 8 | 16 |
| G2 (3.9) | > G1, ≤ 5,5 years | 12 | 13 | 25 |
| G3 (5.7) | > G2, ≤ 7,5 years | 14 | 14 | 28 |
| G4 (7.7) | > G3, ≤ 9,5 years | 14 | 14 | 28 |
| G5 (9.9) | > G4, ≤ 11,5 years | 14 | 14 | 28 |
| G6 (11.4) | > G5, ≤ 13,5 years | 14 | 13 | 27 |
| G7 (13.3) | > G6, ≤ 15,5 years | 11 | 13 | 24 |
| G8 (15.8) | > G7, ≤ 17,5 years | 12 | 14 | 26 |
| G9 (19.1) | > G8 | 11 | 14 | 25 |
