Led by the success of the London 2012 Olympic Games, Nielsen’s State of the Media: 2012 Year in Sports report is a compilation of media highlights, advertiser trends and consumer insights across leading sports properties.

There is no true beginning or end to the sports year and many sports’ seasons straddle both ends of the calendar. In that spirit, and in the interest of delivering the most comprehensive analysis, Nielsen has included data from each sport’s latest completed regular season as of January 10,...