Correlations between Different Heavy Metals in Diverse Body Fluids: Studies of Human Semen Quality

Table 2

Changes in the three main semen parameters through time (1987–2010). A semen parameter was considered normal when the values were equal or above the presented figures [23–26].

	1987	1992	1999	2010
Sperm concentration (×10^6 cells/mL)	20–200^1	≥20	≥20	≥15
Motility (%)	≥60	≥50	≥50	≥40
Morphology (%)	≥50	≥30	≥14	≥4

¹range.