- While there are probably some real differences between populations, differences among different Caucasoid and Negroid populations, at least, appear to be greater than any overall differences between macroraces. I don't find this surprising, since if we looked at, say, height, the same would probably be true.
- I'm not convinced the data support any difference between Northern Europeans and West Africans, and if differences exist, they are relatively minor.
- To the extent we can say anything about intra-Caucasoid differences, there appears to be a trend of declining penis size from Northern/western Europe towards SE Europe, the Middle East, and South Asia.
- Reported values for East Asia do appear to tend toward the low end among worldwide populations.