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.
Ottoman casualties of World War I
If looked at without breakdowns, the total Ottoman losses run almost as high as 25% of the population — approximately 5 million out of population of 21 million. To be more exact, the 1914 census gave 20,975,345 as the population size, of which 15,044,846 was part of the Muslim millet, 187,073 part of the Jewish millet, 186,152 not belonging to any millet, and the remaining 5,557,274 shared by other millets.