After four weeks of the 2012-2013 broadcast television season (through Sunday, October 21, 2012), NBC is in first place among adults 18-49, with a 3.1 rating average, up half a ratings point from last season. CBS was second, with a 2.7 rating average, down six tenths from a year ago. FOX and ABC tied for third, each earning a 2.5, which is down eight tenths and down three tenths, respectively. Univision was fifth with a 1.5 18-49 rating, down a single tenth from last season. The CW finished last with a 0.6 adults 18-49 rating average, down three tenths from last season. Note that the CW season/season comparison is an apples/oranges one because they began their show premieres late and aired a week+ of repeats and summer shows at the start of the 2012-13 season.
Among total viewers, CBS is ahead for the season averaging 11.32 million viewers. ABC is second with 8.77m, followed by NBC with 8.43m, FOX with 6.52m, Univision with 3.61m and CW with 1.44 million.
Each adults 18-49 rating point is a percentage of the adults 18-49 US TV population and equals 1.265 million adults 18-49.
You can see last week's broadcast network primetime weekly TV ratings results here.
Nielsen TV Ratings Data: ©2012 The Nielsen Company. All Rights Reserved.