A Kaiser Permanente study found that increasing urine BPA (Bisphenol-A) level was significantly associated with decreased sperm concentration, decreased total sperm count, decreased sperm vitality and decreased sperm motility.

The five-year study, published in the journal of Fertility and Sterility, recruited 514 workers in factories in China and compared workers who had high urine BPA levels with those with low urine BPA.u00a0