To include so many variations of screen would complicate a lot the study, and without a prior about why it should matter, you are probably safer starting with something more homogeneous.
I'm fairly confident this is not a safe assumption.
> To include so many variations of screen would complicate a lot the study
How so, though?
> without a prior about why it should matter, you are probably safer starting with something more homogeneous.
That's not very scientific, is it? There's no prior as to why it shouldn't matter, which is what the authors seem to think.
Presumably you don’t think that all the white collar workers who aren’t in tech spend all of their work-hours scrolling tiktok/etc.?