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Frequency of illness experienced by survey respondents following previous open-water events, Thames open-water swim, October 2012
| Open-water setting | Respondents who participated in other open-water events, n (%) | Proportion of respondents ill following previous events (%) |
|---|---|---|
| Thames | 310 (49%) | 17 |
| River (excluding Thames) | 110 (17%) | 4 |
| Lake | 423 (67%) | 7 |
| Sea | 236 (37%) | 5 |
