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And you are not a professional either. They had a larger sample - no doubt.
I already clarified my scale in the OP - the Martin-Schultz scale:
1-2 : blue iris (1a, 1b, 1c, 2a : light blue iris - 2b : darker blue iris)
3 : blue-gray iris
4 : gray iris (4a, 4b)
5 : blue-gray iris with yellow/brown spots
6 : gray-green iris with yellow/brown spots
7 : green iris
8 : green iris with yellow/brown spots
9-10-11 : light-brown and hazel iris
12-13 : medium brown iris
14-15-16 : dark-brown and black iris
https://en.wikipedia.org/wiki/Martin...3Schultz_scale
An image of it:
Now, if to you numbers 13, 12 or 11 aren't brown eyes, I don't know what to say. 14 is already dark brown.
The word ''pure'' in such statistics itself bothers me. It's really probably dark brown eyes by the Martin-Schultz scale they counted as ''pure brown''.
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