(Reuters) - Treasury Wine Estates emerges as the worst performer based on earnings metrics among 14 firms in Australia's consumer staples sector, data from Thomson Reuters StarMine shows. The data includes firms tracked by at least three analysts. The firm fares poorly with an Earnings Quality score of 7. A low score in the EQ model suggests poor earnings sustainability over the next 12 months. Eleven out of 13 analysts have cut their EPS estimates on the firm for the year ending 2013 by 4.8 percent since August 17.