as of 2015, there was no evidence for race-based differences in penis size: <https://onlinelibrary.wiley.com/doi/full/10.1111/bju.13010> **It is not possible from the present meta-analysis to draw any conclusions about any differences in penile size across different races.** Lynn suggest that penis length and girth are greatest in Negroids (sub-Saharan Africans), intermediate in Caucasoids (Europeans, South Asians and North African), and smallest in Mongoloids (East Asians), but this is based upon studies that did not meet our present inclusion and exclusion criteria. The greatest proportion of the participants in the present meta-analysis were Caucasoids. There was only one study of 320 men in Negroids and two studies of 445 men in Mongoloids. **There are no indications of differences in racial variability in our present study, e.g. the study from Nigeria was not a positive outlier.** The question of racial variability can only be resolved by the measurements with large enough population being made by practitioners following the same method with other variables that may influence penis size (such as height) being kept constant. Future studies should also ensure they accurately report the race of their participants and conduct inter-rater reliability.
