Tuesday Results:

NBC ranked #1 Tuesday night among the Big 4 networks in adults 18-49, with time-period wins among those nets for "The Biggest Loser" from 8-10 p.m. ET and "Chicago Fire" at 10.

· "The Biggest Loser" (1.9/5 in 18-49, 6.6 viewers overall from 8-10 p.m. ET) jumped 12% week to week in 18-49 (to a 1.9 from a 1.7) and by 19% or 1.1 million person in total viewers (6.626 million vs. 5.561 million), for its top results in both measures since Dec. 17.

· "The Biggest Loser" ranked #1 in the time period in adults 18-49 and other key demographics among ABC, CBS, NBC and Fox.

· "Chicago Fire" (1.8/5 in 18-49, 7.0 million viewers overall from 10-11 p.m. ET) won the 10 p.m. hour among ABC, CBS and NBC in adults 18-49 and every other key demographic. "Chicago Fire" matched last week's 18-49 rating and was up 4% in total viewers (7.032 million vs. 6.765 million) to its top result since Dec. 10.

· L+3 Time-Shifting: "Chicago Fire" added 49% or 0.88 of a point to last week's next-day "live plus same day" 18-49 rating (to a 2.69 in L+3 from a 1.81 in L+SD) and 2.768 million viewers overall (9.531 million vs. 6.765 million).

· NBC is #1 among the Big 4 networks for the night in adults 18-49, women 18-49 and women 25-54 and is tied for #1 among those networks in adults 25-54.

In Late-Night Metered Markets Tuesday night:

· In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 3.2/8; CBS's "Late Show with David Letterman," 2.3/6; and ABC's "Jimmy Kimmel Live," 2.0/5.

· In the 25 markets with Local People Meters, adult 18-49 results were: "The Tonight Show with Jay Leno," 1.1/5; "Late Show," 0.5/2; and "Jimmy Kimmel Live," 0.6/3.

· From 12:35-1:05 a.m. ET, ABC's "Nightline" averaged a 1.2/4 in metered-market households and a 0.4/2 in 18-49 in the Local People Meters.

· From 12:35-1:35 a.m. ET, "Late Night with Jimmy Fallon" (1.6/6 in metered-market households) beat CBS's "Late Late Show with Craig Ferguson" (1.1/4). In the 25 markets with Local People Meters, "Late Night" (0.6/4 in 18-49) topped "Late Late Show" (0.3/2).

· At 1:35 a.m., "Last Call with Carson Daly" averaged a 0.9/4 in metered-market households and a 0.4/3 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. Season figures are averages of "live plus seven day" data except for the two most recent weeks, which are "live plus same day."