Descriptive characteristics of the swimming pool
| Total | Minimum–maximum value | |
| Swimming pool n | 38 | |
| Age swimming pool yrs | 28.6±16.8 | 1.00–87 |
| Number of visitors·yr−1 | 202531±143011 | 45000–840000 |
| Employees n | 29.0±15.1 | 7–67 |
| Part-time employees % | 70.2±21.1 | 15–95 |
| Pools per swimming facility n | 3.3±1.4 | 1.00–6.00 |
| Total water surface m2 | 736.4±703.0 | 186–3575 |
| Surface largest basin m2 | 432.1±341.1 | 160–1800 |
| Disinfection by chlorine | 29 (76) | |
| Disinfection by electrolysis | 11 (29) | |
| Disinfection by ozone | 1 (3) | |
| Estimated chloramine concentration# mg·m−3 | 0.66±0.15 | 0.38–1.10 |
Data are presented as n, mean±sd or n (%), unless otherwise indicated. #: calculated according to the regression model developed in the present study.