World War I casualties
Casualty statistics for World War I vary to a great extent; estimates of total deaths range from 9 million to over 15 million. Military casualties reported in official sources list deaths due to all causes, including an estimated 7 to 8 million combat related deaths (killed or died of wounds) and another two to three million military deaths caused by accidents, disease and deaths while prisoners of war. Official government reports listing casualty statistics were published by the United States and Great Britain. These secondary sources published during the 1920s, are the source of the statistics in reference works listing casualties in World War I. This article summarizes the casualty statistics published in the official government reports of the United States and Great Britain as well as France, Italy, Belgium, Germany, Austria and Russia. More recently the research of the Commonwealth War Graves Commission (CWGC) has revised the military casualty statistics of the UK and its allies; they include in their listing of military war dead personnel outside of combat theaters and civilians recruited from Africa, the Middle East and China who provided logistical and service support in combat theaters. The casualties of these support personnel recruited outside of Europe were previously not included with British war dead, however the casualties of the Labour Corps recruited from the British Isles were included in the rolls of British war dead published in 1921. The methodology used by each nation to record and classify casualties was not uniform, a general caveat regarding casualty figures is that they cannot be considered comparable in all cases.
Croatia during World War I
In July 1918, first cases of Spanish flu, which killed more than 20 million people worldwide, were reported in Croatia. On average, 60 people were dying in Zagreb per week. In the most difficult period of the epidemic that number has grown to more than 200 people, with a peak in the second week of December, when the number increased to 264. In less than four months, Spanish flu took 700 lives in Zagreb alone, and probably tens of thousands on the whole Croatian territory. Contemporaries evaluated that nearly 90% of the Croatian population was affected in the second half of 1918. Estimate of 15,000 to 20,000 victims in Croatia should be taken as the lower limit of the number of victims of the epidemic.