Lead, mercury and other pollutants could be affecting the ratio of boys to girls born each year, according to a study published Thursday in the peer-reviewed journal PLOS Computational Biology.
Pollutants could be preventing some pregnancies from coming to term, with imbalances in how they affect each sex, said Andrey Rzhetsky, a professor of medicine and genetics at the University of Chicago and a lead author on the study. The study examined data for around 150 million Americans for over eight years as well as the entire population of Sweden for over 30 years. Researchers compared medical record data with factors like environmental quality measures, season and temperature.
Areas with higher mercury exposure, for example, tended to produce a slightly higher ratio of boys, while areas with more lead in soil were associated with a higher proportion of girls.
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