BRUXELLES, 13 maggio (Reuters) - Euro zone gross domestic product (GDP) grew in the first quarter of 2015 by 0.4 percent, data from the European statistics agency Eurostat showed on Wednesday. (percentage change) 2015 2014 EURO ZONE Q1 POLL Q4 Q3 Q2 pct change q/q 0.4 0.5* 0.3 0.2 0.1 pct change y/y 1.0 1.1** 0.9 0.8 0.8 EUROPEAN UNION pct change q/q 0.4 0.4 0.3 0.2 pct change y/y 1.4 1.3 1.2 1.3 * Reuters poll of 56 economists, range 0.3 to 0.6 pct ** Reuters poll of 33 economists, range 0.9 to 1.2 pct For Eurostat release, click on: here