One of the things I found in teaching is there is no typical child: all are different, in thousands of ways. You cannot teach them the same way. Demographic and socioeconomic? I have never met a child in public school that chose his parents, his family, his race, his religion, his culture, his family income, and whether or not one parent was missing from the home. So why the worry about all this? It matters not how you teach.
Now the answer you seek: I do not know, I have never noticed.