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.
Ireland and World War I
The number of Irish deaths in the British Army recorded by the registrar general was 27,405, a casualty rate of 14 percent, roughly in line with the rest of the British forces. By contrast, the National War Memorial at Islandbridge, Dublin is dedicated "to the memory of the 49,400 Irish soldiers who gave their lives in the Great War, 1914–1918". This figure is often questioned. Recent estimates for Northern Ireland are given at up to 20,000 casualties, and between 30,000 and 35,000 for the whole of Ireland. It has been suggested that the often-cited death toll of 40–50,000 refers to all the fatalities in the Irish Divisions. In fact, only 71 percent of the casualties in these Divisions were natives of Ireland. According to the Irish National War Memorial, the figure of 49,400 is inclusive of recent Irish immigrants living in America.