South Korea's major companies are expecting slightly sluggish business conditions in April due to concerns over a slowdown of economic growth in China and the U.S. Federal Reserve's tapering of its bond-buying program, a poll showed Thursday. The Business Survey Index (BSI) came to 99.5 for next month, down from 104.4 forecast for March, according to the poll of the largest 600 companies by sales conducted by the Federation of Korean Industries (FKI).