European Factors to Watch-Shares to ease on global growth worries

LONDON, May 2 (Reuters) - European shares were set to fall on Thursday, with concerns about the global economy's health and caution ahead of the European Central Bank's policy meeting prompting investors to trim their trading positions. China's factory-sector growth eased in April as new export orders fell for the first time this year, suggesting the euro zone recession and sluggish U.S. demand may be reining in the country's economic recovery. Data from payrolls processor ADP on Wednes