As someone who spent 6 years at the uni in the first half of 2000’s having access to the mixture of printed and digital materials, and as someone who has to read tons of different formal and informal docs on a daily basis, I can firmly say I don’t care about the results of this study and at least they are irrelevant to me. You need to get your tasks done, research and learn anything? Use whatever medium is available and fits your needs best and allows you to yield better results in a shorter timespan.

I won’t bother printing some programming language documentation and I miss the ability to search through text in printed books.

That being said, printed books smell good, and I enjoy the typographic excellence of them every time I grab a real book.