NCIS

The cast of NCIS. From left are Rocky Carroll, Brian Dietzen, Michael Weatherly, Pauley Perrette, Mark Harmon, Emily Wickersham, Sean Murray and David McCallum. (Kevin Lynch / CBS)

Tuesday night's most-watched show, CBS' "NCIS," gained some ground in the key young-adult demographic, as NBC's "The Voice" was slightly more subdued this week, according to preliminary numbers from Nielsen. 

The popular CBS series averaged 17 million viewers overall and scored a rating of 2.5 among advertiser-desired 18- to 49-year-olds, up 14% from its last original airing two weeks ago. The episode was just two-tenths of a point behind 18-to-49 leader "The Voice," which fell 4% week-to-week to a 2.7 in the demo. 

CBS won the night in total viewership and in the 18-to-49 demographic, in which a rating point equals about 1.3 million viewers, helped by gains from "NCIS" and "Person of Interest" -- up 6% to a 1.9 -- and a status quo delivery from "NCIS: Los Angeles" at a 2.1. On average, CBS drew 14.3 million viewers in prime time and a 2.2 among young adults. 

Following "The Voice," NBC's "About a Boy" earned a 1.7, down 11% from last week, though "Growing Up Fisher" held steady at a 1.5, where it's been for four weeks. "Chicago Fire" gained 6% for a 1.9. 

On ABC, "Marvel's Agents of S.H.I.E.L.D." came in flat with a 1.9 in the demo, while the 1980s-set comedy "The Goldbergs" registered a 1.4, up 14% week-to-week. "Trophy Wife" also improved, adding a tenth of a point for a still-low 0.9, but "Celebrity Wife Swap" continued to flounder, down 11% to a 0.8. 

Fox had a mixed night with its comedies. "Mindy Project" rose a bit from last week to a 1.1 in 18-49, eclipsing its lead-in "New Girl." That Zooey Deschanel sitcom dropped 17% for a 1.0, following another weak showing from "Glee," which notched a 0.8.

In fact, a rising "Originals" on CW tied "Glee" in 18-49. The CW "Vampire Diaries" spinoff had its most-watched night in seven weeks, with 1.7 million people tuning in. "Supernatural" rose 11% week-to-week to a 1.0 in 18-49. 

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ryan.faughnder@latimes.com

Twitter: @rfaughnder