As for China, the world's second-largest economy last month had the biggest trade deficit in at least 22 years, January-February factory output rose by the least since 2009 and retail sales climbed at a slower pace than the median estimate of economists surveyed by Bloomberg News, government data showed March 9 and 10.
In early afternoon trading in New York, the Dow Jones Industrial Average rose 0.34 per cent. The Standard & Poor's 500 Index and the Nasdaq Composite Index slipped, edging lower by 0.06 per cent and 0.08 per cent respectively.
Signs of weakness in the China also weighed on commodity prices. Prices of oil and gold weakened, last 1.1 per cent and 0.8 per cent lower respectively.
Europe's Stoxx 600 Index closed with a 0.2 per cent decline for the day.
As EU finance ministers prepared to give final approval for the second financial rescue package for Greece, it's clear that there's plenty of concern about Portugal.
The yield on Portugal's 10-year bonds is at 13.71 per cent. Two-year rates of 12.48 per cent have doubled in the past year, though they are down from more than 21 per cent at the end of January, according to Bloomberg.
"The market doesn't believe that Greece is a unique case," Matteo Regesta, a senior fixed-income strategist at BNP Paribas SA in London, told Bloomberg. "Portugal is very similar. It would be easy to try to placate and distract the attention of the bond vigilantes, if only policy makers would immediately close the funding gap, pre-empting any further pressure on the periphery. I'm afraid I don't think that's going to happen."