US STOCKS-Wall St ends choppy session lower, weighed by China, oil
* Oil prices set post-2009 lows, before paring losses
* Data shows China's imports fell for 13th consecutive month
* Dow Jones Transport index has worst day since August
* Materials index leads decline, Energy index falls for fifth day
* Indexes down: Dow 0.92 pct, S&P 0.65 pct, Nasdaq 0.07 pct (Updates to close, adds commentary)
By Sinead Carew
Dec 8 (Reuters) - U.S. stocks fell in a choppy session on Tuesday as lower oil prices pressured energy stocks for a fifth day and weak Chinese trade data reignited fears of a global slowdown.
Crude prices hovered near 7-year lows after U.S. crude dipped below $37 per barrel and Brent fell below $40 for the first time since early 2009 on fears that global oil producers will pump even more crude in a saturated market.
Data released overnight showed China's imports fell for the 13th consecutive month, with an 8.7 percent decline in November compared with a year earlier. Continuación...