CBS' "Big Brother 8" no match for FOX's "Are You Smarter Than A Fifth Grader?"

USA National Ratings
(Nielsen)

FOX won Thursday ratings with reruns beating the premier of CBS' reality show, "Big Brother 8."

In the households, FOX dominated the night by scoring a 5.1 rating/9 share followed by CBS in second at 4.8/9. Then ABC at 3.0/6 for third place beating the NBC's 2.4/4 and The CW with 1.3/2.

In the Adults 18-49 demographic key, FOX at 2.6 beating CBS' 2.4 followed by NBC at 1.4 then ABC, 1.3 and The CW, fell below the 1.0 mark.

At 8 p.m.

FOX - "Are You Smarter Than A Fifth Grader" - 4.9/9
CBS - " Big Brother 8" - 4.8/9
ABC - "Ugly Betty" (rerun) - 2.9/5
NBC - "My Name is Earl" - 3.0/6 and "30 Rock" - 2.2/4
The CW - "Smallville" - 1.3/2

At 9 p.m.

FOX on top with "Fifth Grader" (5.4/9) followed by the rerun of ABC's "Grey's Anatomy" 3.5/6 beating CBS' "Pirate Master" at 3.4/6, but CBS had more viewers than ABC. NBC with "The Office" (2.8/5) and "Scrubs" (2.4/4). The CW at steady with "Supernatural" at 1.3/2.

At 10 p.m.

CBS' "CSI", the most watched show for the night (6.2/11) and a "Men in Trees" rerun at 2.7/5 for ABC then NBC's "ER" holding on at 2.1/4.