(Yicai Global) Oct. 23 -- Investor confidence in China lost some of its vigor by midday as mainland traders took a seat on the sidelines amid uncertainties of global economic recovery.

The large cap-heavy Shanghai Composite Index was up 0.13 percent at 3,316.87 by the lunch break. The Star Market Board 50 Index, or Star 50, was down 1.08 percent at 1,361.65 after opening 0.28 percent up.

The Shenzhen Component Index fell 0.35 percent to 13,349.73. The ChiNext Price Index, which tracks growth enterprises in Shenzhen, slid 0.49 percent to 2,660.47.

Editor: Emmi Laine