Exhaustive research in the 1990s made by British writer Bob Couttie as part of a ten-year study of the Balangiga massacre tentatively put the figure at about 2,500; David Fritz used population ageing techniques and suggested a figure of a little more than 2,000 losses in males of combat age but nothing to support widespread killing of women and children Some American and Filipino historians believe it to be around 50,000. The rate of Samar's population growth slowed as refugees fled from Samar to Leyte, yet still the population of Samar increased by 21,456 during the war.