Wow! You lot are seriously over thinking this. The results won't be 'meaningless' because he has 'failed' to define his subjects according to your standards! lol...what the heck are you guys all on?
What is the point of this? No. I agree with the OP...the easiest way to narrow the focus is to define western the way he has for this study....he hasn't said that people who aren't white can't be western...
He also stated in his blog that this research is an extension to previous study that included mostly.white, middle-class, American couples
Let's stop over thinking and not turn this into another whiney, liberal chorus line...it's just cringeworthy.