How the Dow Jones industrial average and other major indexes fared on Thursday

Markets Associated Press

The U.S. stock market endured its worst performance in 18 months on Thursday, driven lower by another slump in Chinese shares and heavy selling by technical traders.

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For the day:

The Dow Jones industrial average lost 358.04 points, or 2.1 percent, to 16,990.69.

The Standard & Poor's 500 index dropped 43.88 points, or 2.1 percent, to 2,035.73.

The Nasdaq composite fell 141.56 points, or 2.8 percent, to 4,877.49.

For the week:

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The Dow is down 486.71 points, or 2.8 percent.

The S&P 500 index is down 55.81 points, or 2.7 percent.

The Nasdaq is down 170.75 points, or 3.4 percent.

For the year:

The Dow is down 832.38 points, or 4.7 percent.

The S&P 500 index is down 23.17 points, or 1.1 percent.

The Nasdaq is up 141.43 points, or 3 percent.