Semen values and sperm chromatin structure assay variables in 250 men according to the sum of the yearly mean blood lead concentration during all years of employment (median (range))
| Sum of yearly average blood lead (μg/dl.years) | |||||
|---|---|---|---|---|---|
| 0–200 n=64 | 201–350 n=60 | 351–650 n=60 | ≥651 n=66 | ANOVA v 0–200 p trend* | |
| *Least square regression of semen characteristics on lead concentration in spermatozoa (continuous variable). | |||||
| Semen volume (ml) | 2.2 (8.7) | 2.5* (6.7) | 2.6* (4.7) | 2.2* (7.9) | >0.05 |
| Sperm concentration (millions/ml) | 38 (335) | 43* (380) | 46* (232) | 50* (219) | >0.05 |
| Total sperm count (millions) | 92 (503) | 92* (700) | 119* (702) | 119* (565) | >0.05 |
| Mean αT | 215 (75) | 209* (345) | 207* (83) | 215* (109) | >0.05 |
| SD αT | 66 (87) | 69* (170) | 67* (94) | 79* (129) | >0.05 |
| Proportion of sperm cells outside the main population | 11 (35) | 10.8* (74) | 11.9* (36) | 13.7* (56) | >0.05 |