Figure 3
Proportional increase in disease risk due to space-time clustering (D 0 (s, t)) with the K-function. The elevated surface illustrates the excess in risk for AEP within certain spatial and temporal distances. The retrospective study included all farms with at least one reported case of acquired equine polyneuropathy in Norway and Sweden during 1995-2012, for which the month of occurrence of the first case was known (n = 135).