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Table 1 Annual mean temperature correlated with malaria cases in 1800–1870.

From: Endemic malaria: an 'indoor' disease in northern Europe. Historical data analysed

Year correlated with malaria cases in 1800–1870 Source of temperature series
  Helsinki 1830–1870 41 years Tornedalen 1818–1870 53 years Stockholm 1800–1870 71 years St. Petersburg 1806–1870 65 years
malaria year-1 0.1364 0.1133 0.1238 0.0958
malaria year 0.0996 -0.1177 -0.0822 -0.1164