Stocks were mostly lower Thursday after a report of slowing productivity growth intensified worries that higher interest rates are on the way. About 1:25 p.m. ET, the Dow Jones industrial average was down 30.41 to 10,449.72. The Nasdaq composite index was down 4.00 at 3703.31, and the Standard & Poor's 500 index was down 4.40 at 1410.70. The New York Stock Exchange composite index was down 0.04 at 631.87, and the American Stock Exchange composite index was up 4.97 at 919.37. The yield on the 30-year Treasury bond rose to 6.15% from 6.11% late Wednesday.