From a peer-reviewed journal article:
It has been reported that there are differences in testosterone levels in some different groups. For example it has been demonstrated that there are inter-racial differences in total serum testosterone between North America Indians (includes mixed racial North American Indians) and Caucasians (Brooks & Reddon, 1996; Studer, Reddon, & Siminoski, 1997).
So what’s wrong? Why are those of dual ethnicity described as mixed racial North American Indians and not mixed racial Caucasians?
This is racist hypodescent (one drop rule) theology and should not be tolerated by science journals.
Source: Studer, L., Aylwin, S., and J. Reddon. 2005. Testosterone, Sexual Offense Recidivism, and Treatment Effect Among Adult Male Sex Offenders. Sexual Abuse: A Journal of Research and Treatment 17(2): 171-181. DOI: 10.1007/s11194-005-4603-0.