Louisville-based Tricon Global Restaurants, the largest global restaurant company in terms of system units, today [Thursday] reported estimated that US blended same-store sales at company restaurants increased 4% during the four-week period ended 23 March 2002 (Period 3). For the comparable four-week period, US same-store sales increased 7% at Taco Bell, 4% at KFC and were even with last year at Pizza Hut.