The study, carried out by the nonprofit Pew Internet & American Life Project through phone interviews of more than 2,200 people, showed that those who are younger, wealthier and use the Internet are more likely to own such gadgets.
While one in five people under the age of 30 have an iPod or other MP3 player, the number dropped to one in seven in the 30-to-39 and 40-to-48 age groups.
Similarly, about a quarter of people with household incomes of $75,000 or more owned such gadgets. That figure dropped to 10 for those in the $30,000 to $75,000 range and to 6 percent among those earning less than $30,000.
The study indicated that those who use the Internet are four times as likely as non-Internet users to have MP3 players. These gadgets have a gender divide too. The study showed that men have a 50 percent greater chance than women of owning a digital media player.