The ratio between the second and fourth digits is a sexually dimorphic measure, established in utero and linked to prenatal sex steroid levels. An association was found between prenatal levels of Polybrominated Biphenyls, a synthetic chemical suspected to disrupt the endocrine system function, and the digit ratio in adult women.
CITATION STYLE
Wainstock, T., Pearce, B., Barr, D. B., Marder, M. E., Terrell, M., & Marcus, M. (2016). Exposure to PBB-153 and Digit Ratio. Early Human Development, 103, 33–35. https://doi.org/10.1016/j.earlhumdev.2016.07.004
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