The Royal Statistical Society analyzed death rates for the two armies between Feb. 5 and June 24, reported The Sunday Telegraph. During that time, Britain lost 23 of its 5,500 soldiers, while the United States lost 463 of its 165,000 soldiers, the newspaper reported.

Increased violence in the southern city of Basra, where most of the British troops are serving, was responsible for the proportional increase in deaths, said Society spokeswoman Sheila Bird.

The findings have led to more calls for the British government to withdraw its troops from Iraq, the newspaper reported.

British military and political leaders have come to regard the war in Iraq as a "lost cause," a senior British army commander told the British newspaper.