access to books at home & a child's educational progress

This piece over at The Telegraph draws on studies into children's educational prospects in relation to whether their homes contain books or not. Apparently, "being raised in a household with a 500-book library would result in a child remaining in education for an average of three years longer than those with little access to literature."

I wonder if that is susceptible to change where books are stored in the home electronically - e.g. on a Kindle. That is, does the positive impact of book at home in part lie in the ability to browse a physical bookshelf?


And how would it apply to the availability of specifically Christian books in the home?