True, the guys in Ghana are at least 5 inches longer on average. But so are the European guys. I guess that makes it equal again.
You think it might be noteworthy that the sample they studied in Nigeria were not all full grown men?
From your link
Five basic measurements of the male external genitalia were studied in 320 healthy male medical students belonging to the various parts of Nigeria (West Africa). Their ages range from 17 to 23 years. The measurements were as follows: average length of the penis (81.6 +/- 0.94 mm); circumference of the penis (88.3 +/- 0.02 mm); circumference of the scrotum (212.6 +/- 2.48 mm); length of right testis (46.8 +/- 0.54 mm); width of right testis (32.4 +/- 0.37 mm); length of left testis (46.0 +/- 0.53 mm); and width of left testis (31.4 +/- 0.36 mm). The size of the genitalia increases with the increase in age in younger year groups. The adult stages of genitalia development are reached at the age of 21 years in 89.0% of the individuals. The growth of the genitalia is continued with the increasing height and weight, but this growth slows down after attaining a definite height and weight.
Now, if they had a sample drawing from men all aged 21 or more, you could say they were at least 89% grown. But since they also sampled ages 17,18,19, and 20, these would be incrementally less grown in 11% or more of the sample.
If they sampled from ages 17-23, it would seem quite possible that the majority were not full grown. 17-20 is 4 different ages. 21-23 is 3 different ages.
To put it another way, if by age 21, 89% of males are full grown, then for 20 years of age, what percentage are full grown? 85%? And for 19? 81%?
18? 75%? 17, 66%?
Now, maybe most of them were 21 or older, and just a few were 17-20 years old. Don't really know, however by the info in that abstract, I think scientifically we can at least concede the possibility the samples aren't even similarly grown in comparison to samples from other regions.
And this is to say nothing of the study not documenting erect size, which is sort of the whole point of this topic.
Now, take that Nigerian study, sample ages 17-23, which we know means they were not all full grown, maybe even most of them were not full grown, and compare with the Wessell's study:
Wessells et al. [5] published their data regarding penile length and indications for penile augmentation. They examined penile lengths in 80 men with a mean age of 54 years
I think it is as safe to say that the Wessells sample was as certainly full grown as the Ajmani sample was not.
And for the Indian study, the sample ages were from 18-60. The Jordanian study (Awwad
et al) was ages 17-83.
Still, despite this significant discrepency, I'm not going to try and say each of those three studies are meaningless. It just means less than if it was more consistent.
LOL but seriously why is this such a finicky topic for academics? Why can't they just get samples from groups of the same age and do some consistent research across the board instead of leaving out the main measurement everyone especially on this forum thinks is the most important thing in the world. Hehe.