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| Grade | characteristic |
| Grade 1 | Sperm are immotile and fail to move. |
| Grade 2 | Sperm known as non-progressive motility. They do not move forward despite the fact that they move their tail (vibrating-like movement). |
| Grade 3 | Sperm known to have non-linear motility. They also move forward but tend to travel in a curved or crooked motion. |
| Grade 4 | Sperm have progressive motility meaning that they are the strongest and swim fast in a straight line. |
