The confidence indicator reached minus 4 points versus minus 2 the previous month and was the same as a year earlier, the office said in a report on Thursday.

"In January 2018 consumers' opinion about the country's economy was at its historical peak. Since then it has decreased considerably, especially in the last two months," the office said.

Analysts said consumers were worried that trade disputes could dent the export-oriented Slovenian economy although the government expects growth of 5.1 percent this year versus 5 percent in 2017, boosted by exports and investment.

The office said consumers were more pessimistic about employment, while their expectations regarding savings and the financial position of households improved.

Lower consumer confidence could push down the country's business sentiment indicator due from the statistics office on Monday.