03/28/2008 02:44 am ET | Updated May 25, 2011

Only 13 Shows Gained Viewers In 2006-07 TV Season

Networks blame a ratings downturn during the just-concluded 2006-07 season on a number of factors, including delayed viewing on DVRs and the early onset of Daylight Saving Time.

They acknowledge that creative difficulties for some shows, including Fox's 24 and ABC's Lost, and increased competition also likely played a significant role in the declines. Only 13 series saw gains this season.

Many strong series were forced to face off against each other, crammed together to avoid American Idol, which remains a powerhouse despite weakened ratings. To steer clear of Idol on Tuesdays and Wednesdays, the networks squeezed most of television's top shows into three jam-packed nights--Sundays, Mondays and Thursdays--during the second half of the season.

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