In this study, the authors investigated the relationship between developmental stuttering and serum testosterone levels in this study, and reported that the findings of this study show that testosterone may have an effect on the severity of developmental stuttering and on the clinical differences between sexes.
Selcuk, Engin Burak, Erbay, Lale Gonenir, Ozcan, Ozlem Ozel, Kartalci, Sukru, and Batcioglu, Kadir. (2015). Testosterone levels of children with a diagnosis of developmental stuttering. Therapeutics and Clinical Risk Management, 11, 793-798.