Epidemiological Studies
In a study of 341 schoolchildren, Bernard and his colleagues found that long-term attendance at indoor chlorinated swimming pools by the children up to the age of about 6–7 years was a strong predictor of airway inflammation (measured by exhaled nitric oxide) independently of other factors, while for those children susceptible to allergic problems, as defined by having a blood serum level of immunoglobulin E greater than 100 kIU/L, their total time spent at indoor chlorinated swimming pools was a strong predictor of the probability that they would have asthma.
Read more about this topic: Pool Chlorine Hypothesis
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