A recent study concluded that sports television viewership is vastly underreported due to the failure to count viewers watching from out-of-home locations like bars, airports, and college dorms.

According to an ESPN-sponsored study by the Total TV Audience Monitor, there are over 36 million people age 18 and up that watch TV outside of their home in unmeasured locations such as bars, airports and college dorms. An estimated 86 million adults visit out-of-home locales with access to TV on a weekly basis.

The study, which was conducted with more than 4,000 adults, reports that the total average quarter-hour TV viewership increases 4 percent when out-of-home viewing is included. It increases 11 percent among 18-to-34-year-olds because nearly 10 million college students watch TV in locations other than their homes. Most of the unreported viewing is by college students in off-campus housing and on-campus facilities (18.6%); other popular viewing locations include the workplace (13.9%), hotels and motels (13.2%), second homes (10.8%), and restaurants or bars (6.9%).

Among cable networks, ESPN gets the biggest audience boost when out-of-home viewing is included; MTV is next, followed by TBS, Comedy Central, and TNT. Among viewers 18-plus, CNN ranks in second place behind ESPN.