Thursday Primetime Results:

· From 8-9 p.m. ET, "The Sing-Off" (1.2/4 in adults 18-49, 4.4 million viewers overall) retained 92% of last week's 18-49 rating (1.2 vs. 1.3) and 97% of last week's total-viewer result (4.437 million vs. 4.576 million), despite this week facing the "X Factor" finale and ABC's encore of "A Charlie Brown Christmas." "The Sing-Off" finished within 0.3 of a point of Fox's "X Factor" finale in the 8-9 p.m. hour (1.2/4 vs. 1.5/5 from 8-9) and within 0.1 in men 18-49 (0.9 vs. 1.0). "The Sing-Off" was up by 28% versus NBC's slot averages for last season in total viewers (4.437 million vs. 3.461 million).

· An encore telecast of "Saturday Night Live Christmas" (1.7/5 in adults 18-49, 4.3 million viewers overall from 9-11 p.m. ET) won its second hour from 10-11 p.m. among ABC, CBS and NBC in adults 18-49, adults 18-34 and adults 25. Excluding the nights of "The Sound of Music Live!" and NFL Thanksgiving football, "SNL Christmas" earned NBC's highest 18-49 rating in the time period since Sept. 26 and biggest overall audience in the slot since Oct. 3. The "SNL" special is up versus NBC's average in the time period last season by 31% in adults 18-49 (with a 1.7 rating vs. a 1.3, "live plus same day" non-sports) and up 25% in total viewers (4.319 million vs. 3.455 million).

· For the night, NBC is tied for #2 in adults 18-49 among the Big 4 nets and tied for #1 in men 18-49 and men 18-34.

In Late-Night Metered Markets Thursday night:

· In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.5/7; CBS's "Late Show with David Letterman," 2.3/6; and ABC's "Jimmy Kimmel Live," 2.4/6.

· In the 25 markets with Local People Meters, adult 18-49 results were: "The Tonight Show with Jay Leno," 0.8/4; "Late Show," 0.5/2; and "Jimmy Kimmel Live," 0.9/4.

· From 12:35-1:05 a.m. ET, ABC's "Nightline" averaged a 1.5/5 in metered-market households and a 0.6/4 in 18-49 in the Local People Meters.

· From 12:35-1:35 a.m. ET, "Late Night with Jimmy Fallon" (1.3/4 in metered-market households with an encore telecast) beat CBS's first-run "Late Late Show with Craig Ferguson" (1.1/4). In the 25 markets with Local People Meters, "Late Night" (0.5/3 in 18-49 with an encore) topped "Late Late Show" (0.2/2).

· At 1:35 a.m., "Last Call with Carson Daly" averaged a 0.8/3 in metered-market households with an encore and a 0.3/3 in adults 18-49 in the 25 markets with local people meters.

NOTE: All ratings are "live plus same day" from Nielsen Media Research unless otherwise indicated.