Civilian casualty ratio
Some 7 million combatants on both sides are estimated to have died during World War I, along with an estimated 10 million non-combatants, including 6.6 million civilians. The civilian casualty ratio in this estimate would be about 59%. Boris Urlanis notes a lack of data on civilian losses in the Ottoman Empire, but estimates 8.6 million military killed and dead and 6 million civilians killed and dead in the other warring countries. The civilian casualty ratio in this estimate would be about 42%. Most of the civilian fatalities were due to famine, typhus, or Spanish flu rather than combat action. The relatively low ratio of civilian casualties in this war is due to the fact that the front lines on the main battlefront, the Western Front, were static for most of the war, so that civilians were able to avoid the combat zones.
German casualties in World War II
Statistics for German World War II military casualties are divergent and contradictory. The wartime military casualty figures compiled by German High Command, up until January 31, 1945, are often cited by military historians when covering individual campaigns in the war. A recent study by the German historian Rüdiger Overmans found that the German High Command statistics are not reliable, he estimated German military dead at 5.3 million, including 900,000 men conscripted from outside of Germany's 1937 borders, in Austria and in east-central Europe. The German government still maintains that its records list 4.3 million dead and missing military personnel. Civilian deaths during the war include air raid deaths, estimates of German civilians killed only by Allied strategic bombing have ranged from around 350,000 to 500,000.
Civilian deaths, due to the flight and expulsion of Germans and the forced labor of Germans in the Soviet Union are disputed and range from 500,000 to over 2.0 million. According to the German government "Suchdienste" (Search Service) there were 300,000 German victims (including Jews) of Nazi racial, political and religious persecution. This statistic does not include 200,000 German people with disabilities who were murdered in the Action T4 and  Action 14f13 euthanasia programs.