«The authors analyzed malaria statistics that were collected in Finland from 1750 to 2008 via correlation analyses between malaria frequency per million people and all variables that have been used in similar studies throughout other parts of Europe,» including temperature data, animal husbandry, consolidation of land by redistribution and household size... report that «malaria was a common
endemic disease in Finland in the 18th and 19th centuries and prevalent in the whole
country,» and they say that «mortality during malaria epidemics
usually varied between 0.85 and 3 %.»