Traders work on the floor of the New York Stock Exchange in New York City on January 6, 2016.
Spencer Platt—Getty Images

Uncertainty about how quickly China’s economy is weakening continued to hammer U.S. stock markets on Thursday, sending the Dow Jones industrial average down 392 points – or 2.3 percent of its total value — for its biggest loss in three months.

Reuters reported that the Dow’s 5.2 percent decline in the first four trading days was its worst performance to begin a year since the 30-stock index’s creation in 1928.

The Standard & Poor’s 500 index and the Nasdaq composite also were creamed, with the former losing 47 points, or 2.4 percent, and the latter sliding 146 points, or 3 percent.

The Dow and Nasdaq ended the day more than 10 percent below…

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