ABC’s medical drama “Grey’s Anatomy” made a big ratings impact in its new Thursday 9 p.m. (ET) time slot, helping the network win the night in adults 18 to 49, something ABC has been unable to do with regular programming for years.

“Grey’s” garnered a 10.9 preliminary national rating in adults 18 to 49, a number that includes live viewing and same day viewing via digital video recorders, according to Nielsen Media Research. That was a 31 percent increase over its September 2005 Sunday night season premiere (8.3), and a 319 percent increase over the year ago time period premiere of the canceled drama “The Night Stalker.”

Easily the No.1 show for the night in adults 18 to 49, “Grey’s” eclipsed the season premiere of time period veteran “CSI” on CBS, which scored a 7.5, down 31 percent from its season premiere last year.

The time period premiere of NBC’s “Deal or No Deal” scored a 3.5 at 9 p.m., down 24 percent from last year’s season premiere of “The Apprentice” in the time period.

At 8 p.m. CBS was tops in the demo with the second episode of “Survivor: Cook Islands” with a 6.4, down 2 percent from its premiere last week. A “Grey’s” clip show on ABC was second in the time period with a 4.8. NBC’s season premieres “My Name Is Earl” (3.7) and “The Office” (4.3) gave NBC third place in the hour among the networks, with Fox in fourth with its comedies “‘Til Death” (2.2) and “Happy Hour” (1.7).

At 10 p.m. NBC was the winner in adults 18 to 49 with the season premiere of medical veteran “ER,” which scored a 6.8. That was up 8 percent from “ER’s” premiere last year.

ABC’s debut of “Six Degrees” was second in the time period with a 5.8, up 132 percent from last year’s season debut of newsmagazine “Primetime.” CBS was third in the time period with the debut of its drama “Shark” (4.2), which was down 52 percent from the season premiere of “Without a Trace” last season.

ABC won the night in the demo with a 7.2, followed by CBS (6.0), NBC (4.8), Fox (1.6) and a repeat-laden The CW (1.0).