Table 1.
WHO 2010 (5th edition) and WHO 2021 (6th edition) lower fifth percentile (with 95% confidence interval) of semen parameters from men in couples starting a pregnancy within one year of unprotected sexual intercourse leading to a natural conception (adopted from Boitrelle et al. [5]).
| Parameter | WHO 2010 | WHO 2021 |
|---|---|---|
| Semen volume (ml) | 1.5 (1.4–1.7) | 1.4 (1.3–1.5) |
| Total sperm number (106 per ejaculate) | 39 (33–46) | 39 (35–40) |
| Total motility (%) | 40 (38–42) | 42 (40–43) |
| Progressive motility (%) | 32 (31–34) | 30 (29–31) |
| Non-progressive motility (%) | 1 | 1 (1–1) |
| Immotile sperm (%) | 22 | 20 (19–20) |
| Vitality (%) | 58 (55–63) | 54 (50–56) |
| Normal forms (%) | 4 (3–4) | 4 (3.9–4) |