LONDON — Even before a potential knock to economic sentiment from the Brussels attacks, confidence across the 19-country eurozone was already on the wane.

A survey from the European Union’s executive arm showed that economic confidence across the bloc fell in March for a third month running to a 13-month low, the latest in a run of figures to indicate that the recovery is losing pace.

In its monthly assessment, the European Commission said its economic sentiment indicator fell 0.9 points to 103.0 in March. That was a bigger fall than anticipated and has reinforced worries about the economy.

The commission said the deterioration in sentiment was because of lower confidence among consumers as well as managers in the services and construction sectors. It was also fairly broad-based across countries, with Italy and France faring particularly badly. Germany, the region’s biggest economy, held up better.

Few economists say the eurozone economy will fare much better in the coming months regardless of any negative repercussions stemming from the Brussels attacks. The commission noted that the survey was conducted before the March 22 attacks that killed 32 people.