The study, published recently in Social Science Research, assessed data from 160,000 adults from 31 countries, including the United States, Canada, the United Kingdom, Australia, Turkey, Japan and Chile. Participants filled out surveys with the Programme for the International Assessment of Competencies, which measures proficiency in three categories: literacy, numeracy (using mathematical concepts in everyday life) and information communication technology, (using digital technology to communicate with other people, and to gather and analyze information).
Respondents, who ranged in age from 25 to 65, were asked to estimate how many books were in their house when they were 16 years old. The research team was interested in this question because home library size can be a good indicator of what the study authors term “book-oriented socialization.” Participants were able to select from a given range of books that included everything from “10 or less” to “more than 500.”
The effects were most marked when it came to literacy. Growing up with few books in the home resulted in below average literacy levels. Being surrounded by 80 books boosted the levels to average, and literacy continued to improve until libraries reached about 350 books, at which point the literacy rates leveled off. The researchers observed similar trends when it came to numeracy; the effects were not as pronounced with information communication technology tests, but skills did improve with increased numbers of books.
Interesting research findings. Read the source article here.