OAK BROOK, Ill. - McDonald's says a key sales figure climbed 3.7 percent in August, as the fast food chain emphasized the value of its menu items amid the challenging global economy.

The world's biggest hamburger chain's strongest performance came from the Asia/Pacific region, Middle East and Africa, with revenue at stores open at least 13 months up 5.7 percent.

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The U.S. and Europe also posted gains, led by strong sales of breakfast and value items in the United States and strength in the U.K., France and Russia.

Systemwide sales for the month rose 1.2 percent.

Shares of McDonald's Corp., which is based in Oakbrook, Ill., fell 30 cents to $91 in premarket trading Tuesday.