No. | Age (year) | Testes length × width (cm) | Semen volume (ml) | Sperm concentration (×106/ml) |
1 | 4 | 3.4 × 1.9 | 0.25 | 0 |
2 | 4 | 3.5 × 1.8 | 0.25 | 0 |
3 | 3 | 3.2 × 1.8 | 0.2 | 0 |
4 | 7 | 4.0 × 2.0 | 0.2 | 10* |
5 | 5 | 3.8 × 1.8 | 0.2 | 41** |