Fig. 4

Reported respiratory symptoms in swimming hall users according to a swimming distance of less than 500 m, greater than 500 m but less than 1000, greater than 1000 m, greater than 1000 m but less than 2000 m or greater than 2000 m
Reported respiratory symptoms in swimming hall users according to a swimming distance of less than 500 m, greater than 500 m but less than 1000, greater than 1000 m, greater than 1000 m but less than 2000 m or greater than 2000 m