McDonald's, the world's largest fast food company, said Friday that U.S. same-store sales climbed 6.2 percent in March.

McDonald's Corp. said the ongoing appeal of new products, including the Snack Wrap, core menu favorites and its "everyday affordability" continues to drive performance and to generate increased customer visits.

Same-store sales, or sales at stores open at least a year, are a key measure of restaurant performance, because they measure growth at existing stores rather than from newly opened ones.