A new survey from USA Today and book discovery website Bookish finds that U.S. adults who own a tablet or e-reader read more books than the device-less. The survey also found differences in reading habits between adults under 40 and adults over 40.

The survey polled 1,000 adults nationwide and an additional 819 adults who own an e-reader or tablet. Overall, it found that 40 percent of adults — and 46 percent of those between 18 and 39 — owned a tablet or e-reader, “doubling the numbers from less than two years ago.”

Thirty-five percent of those who owned a device said they read more since getting it. Of the device owners, those ages 18-39 had read an average of 21 books in the past year, while respondents ages 40 and over had read an average of 16 books in the past year.

Those who didn’t own a device read…