Before revision: In a later study by the Bernard group of 190,000 children in 21 countries in Europe, it was found that 13 to 14 year old children were 2% to 3.5% more likely to have or have had asthma for every additional indoor chlorinated pool per 100,000 inhabitants in their place of residence.
After revision: In a later study by the Bernard group of 190,000 children in 21 countries in Europe, it was found that 13- to 14-year-old children were 2% to 3.5% more likely to have or have had asthma for every additional indoor chlorinated pool per 100,000 inhabitants in their place of residence.