After examining statistics from 27 nations, a group of researchers found the presence of book-lined shelves in the home — and the intellectual environment those volumes reflect — gives children an enormous advantage in school.

“Home library size has a very substantial effect on educational attainment, even adjusting for parents’ education, father’s occupational status and other family background characteristics,” reports the study, recently published in the journal Research in Social Stratification and Mobility. “Growing up in a home with 500 books would propel a child 3.2 years further in education, on average, than would growing up in a similar home with few or no books.

“This is a large effect, both absolutely and in comparison with other influences on education,” adds the research team, led by University of Nevada sociologist M.D.R. Evans. “A child from a family rich in books is 19 percentage points more likely to complete university than a comparable child growing up without a home library.”