But it said the scandal over phone quizzes across the sector had turned the public off entering the competitions and this had a "material effect" on revenues from its premium-rate telephone services.
The review, which started in March, came after it emerged that television producers, including Channel 4's Richard and Judy Show, the BBC's Blue Peter, GMTV's breakfast shows and ITV's own Make Your Play, had unfairly mislead quiz contestants by keeping the phone lines open after the contest had already ended.
In early 2007, ITV closed the ITV Play channel, citing insufficient revenue, but continued with ITV Play programming during the night on ITV1 and ITV2. Revenue from ITV Play was down "significantly" from the same period in 2006.
ITV's revenue from premium-rate telephone services, excluding ITV Play, was down about 20% in March and April, with no sign of a recovery.
Total UK television advertising revenue stabilised in the first half of 2007 and was flat compared with the same period in 2006.
ITV underperformed the market, with a year-on-year revenue drop of 5.7% for the first half of 2007. Revenue for flagship channel ITV1 was down 9.6%.
For the first 17 weeks of 2007, ending 29 April, the ITV channels, including GMTV, achieved a viewing share of 21.9% in multi-channel homes, slightly better than the same period in 2006.
In all homes, the ITV1 adult share of commercial impacts was 6.2% down year on year, at 32.6% of the market.
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