via Television Bureau of Advertising:

A18+ was the bases for estimates for newspapers, consumer books, consumer magazines, out-of-home, yellow pages, home video and in-flight entertainment.
P12+ was the bases for estimates for Total TV, radio, recorded music, movies in theaters, videogames, consumer Internet and mobile content.
(1) Total TV includes Network-affiliated stations, Independent and Public stations, and Basic and Premium Cable, Satellite & RBOC Networks.
(2) Internet and mobile use of traditional media, such as downloaded music, newspaper websites or info alerts, e-books, cable modems, online video of TV programs and internet radio, was included in the traditional media segment, not in pure-play internet or mobile content. Pure-play internet and mobile services includes telecommunications access, such as DSL and dial-up, but not cable modems, pure-play content, such as eHarmony, GameSpy and MobiTV, and mobile instant messaging and e-mail alerts.
(3) Playback of prerecorded VHS cassettes and DVDs only.
Source: Veronis Suhler Stevenson Twenty-Second Edition 2009-2013

Reports of the demise of television watching continue to be premature. People may be spending time watching video online, downloading torrents, playing video games, and whatever else, but they’re continuing to watch more TV on average as well.
