The group, which is the UK's largest newspaper publisher, said the display advertising market has continued to be volatile.
Victor Blank, chairman of Mirror Group, said: "At this stage, the directors believe it is prudent to plan on the current advertising conditions remaining throughout most of the year. However, given our trading performance to date, the board continues to have confidence in the financial outcome for the year."
However, while its national titles are struggling there was better from its regional newspaper activities. Total advertising revenue there was down only 2.8% in the first four months.
It had been feared that the slump at its regional titles would be much worse as they are being sustained by high levels of recruitment and property advertising.
Earlier today, Trinity Mirror called off the sale of eight regional newspapers to Johnston Press after the government ruled last week that it could only sell four of the titles on competition grounds.
Last month, Trinity Mirror sold the Dublin-based Sunday Business Post to family-owned newspaper group Thomas Crosbie Holdings for £6.1m.
Trinity Mirror owns around 250 regional papers and a range of trade titles, as well as the its third national title the Sunday People, the Racing Post and its two Scottish dailies, the Daily Record and the Sunday Mail.
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