The Rise of E-Reading - Pew Research Center

Read all about it at the study overview link below

"In a February survey, 21% of adults said they had read a e-book in the last year, compared to 17% who reported doing so in December. This tracked with a major spike in ownership of e-reader devices that occurred during the holiday gift-giving season in December. During that period, ownership of an e-book reader or a tablet each increased to 19% of adults, compared to 10% for each device in mid-December.
Those who read e-books read more books than those who don't have the devices: The average reader of e-books has read 24 books (the mean number) in the past 12 months, compared with an average of 15 books by a non-e-book consumer. For device owners, those who own e-book readers also stand out. They say they have read an average of 24 books in the previous year (vs. 16 books by those who do not own that device). They report having read a median of 12 books vs. 7 books by those who do not own the device)."

The Rise of E-Reading - Pew Research Center