Fig. 4From: Epidemiological situation of Lyme borreliosis in Belgium, 2003 to 2012Number of positive laboratory tests for Lyme borreliosis, by month, 2003–2012, Belgium. Box plot: The mean and median annual number of positive tests are presented by month. The length of the box represents the interquartile range (the distance between the 25th and the 75th percentile). The horizontal line in the box represents the median, and the diamond, the mean. The wiskers extend to the group minimum and maximum valueBack to article page