| YEAR | Total | 2018 | 2019 | 2020-2021.2 | p |
| Number | 21,715 | 8029 | 7502 | 6184 | |
| Age (year) | 31.19 ± 5.58 | 31.36 ± 5.74 | 31.07 ± 5.47 | 31.10 ± 5.49 | 0.074 |
| Abstinence days (day) | 4.06 ± 1.22 | 4.00 ± 1.20 | 4.18 ± 1.22 | 4.00 ± 1.24 | <0.01 |
| Semen volume (ml) | 3.57 ± 1.61 | 3.52 ± 1.60 | 3.61 ± 1.66 | 3.59 ± 1.54 | <0.01 |
| Sperm concentration (106 per ml) | 42.34 ± 28.50 | 43.74 ± 29.97 | 41.67 ± 28.48 | 41.32 ± 26.44 | <0.01 |
| Total sperm number (106 per ejaculate) | 146.67 ± 119.72 | 148.92 ± 123.43 | 146.21 ± 122.75 | 144.29 ± 110.72 | 0.263 |
| Progressive motility (PR) | 0.32 ± 0.19 | 0.28 ± 0.18 | 0.33 ± 0.19 | 0.34 ± 0.19 | <0.01 |
| Total PR number (106 per ejaculate) | 54.18 ± 62.23 | 50.64 ± 61.99 | 56.13 ± 64.20 | 56.42 ± 59.89 | <0.01 |
| Total motility (PR + NP) | 0.51 ± 0.22 | 0.51 ± 0.22 | 0.51 ± 0.22 | 0.53 ± 0.21 | <0.01 |
| PH | 7.39 ± 0.16 | 7.39 ± 0.17 | 7.40 ± 0.15 | 7.38 ± 0.15 | <0.01 |