A congressional study and several news stories in September questioned reports by the U.S. military that casualties were down. Sen. Hillary Rodham Clinton (D-N.Y.), challenging the testimony of Gen. David H. Petraeus, asserted that “civilian deaths have risen” during this year’s surge of American forces. A month later, there isn’t much room for such debate, at least about the latest figures. In September, Iraqi civilian deaths were down 52 percent from August and 77 percent from September 2006, according to the Web site icasualties.org. The Iraqi Health Ministry and the Associated Press reported similar results. U.S. soldiers killed in action numbered 43 — down 43 percent from August and 64 percent from May, which had the highest monthly figure so far this year. The American combat death total was the lowest since July 2006 and was one of the five lowest monthly counts since the insurgency in Iraq took off in April 2004. During the first 12 days of October the death rates of Iraqis and Americans fell still further. So far during the Muslim month of Ramadan, which began Sept. 13 and ends this weekend, 36 U.S. soldiers have been reported as killed in hostile actions. That is remarkable given that the surge has deployed more American troops in more dangerous places and that in the past al-Qaeda has staged major offensives during Ramadan. Last year, at least 97 American troops died in combat during Ramadan. Al-Qaeda tried to step up attacks this year, U.S. commanders say — so far, with stunningly little success.