Table 2.
Calibrated reference values of sperm concentration.
| Grade | Range (million cells/mL) |
| 0 | 0 |
| 1 | <13.9 |
| 2 | 0-27.7 |
| 3 | 28.3-51.9 |
| 4 | 50.7-113.9 |
| 5 | 153.4-217.6 |
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