Gert E. Olsson*†
, Fredrik Dalerum*1
, Birger Hörnfeldt†, Fredrik Elgh†, Thomas R. Palo*2
, Per Juto†, and Clas Ahlm†
Figure 4. Correlation between incidence on reported nephropathia epidemica cases in respective counties within the northern region in winter (January–March) and previous autumn (late September) bank vole–trapping indices in Västerbotten during 1991 to 2001 (data presented nontransformed, before statistical analyses).