For the fourth week in a row, CBS won the week in the adults 18 to 49 demographic. For the week ended Aug. 21, the Thursday repeat of the procedural drama “CSI” was the top-rated show in adults 18 to 49 with a 4.1 rating, according to Nielsen Media Research.

“CSI” lead-out “Without a Trace” took the No. 2 spot with a 4.0, followed by Fox’s summer reality series “So You Think You Can Dance” with a 3.5, and the Tuesday edition of CBS’s “Big Brother 6” (3.4).

CBS won the week in the demo with a 2.5, followed by Fox (2.1), ABC (2.0), NBC (1.9), UPN (1.1) andThe WB (0.8).