Figure 3. The self-reported illness and the modelled E. Coli concentrations during the 3.8 km open water swimming competition in 2010, Copenhagen.

Percentage of self-reported illness (line) in each of the seven swim groups of the 2010 competition and modelled E. coli concentrations during the competition (bars). Group 1 consisted of professionals (mean swimming time 55 minutes), group 2 of women and seniors (mean swimming time 81 minutes) and groups 3-7 of men at different ages (mean swimming time between 65-79 minutes), grouped by starting number.