From studies carried out recently in Greece found that children of school age asthmatic type symptoms during the past 12 months appear to 5-10% of pupils. The rates are doubled when the question is not limited to the last 12 months. Also in a study involving 2133 children aged 7 and 18 years, the prevalence of asthma was 7.7% and 4.7% (at the age of 7 and 18 years respectively) and chronic asthma 19.6% and 26.3% (at the age of 7 and 18 years, respectively), while over half of the children (58.2%) with early asthma (asthma diagnosed before age 7) had no symptoms at the age of 7. At the age of 18 still had symptoms for 7.6% of children with early asthma and 48.2% of children who developed asthma between 7-18 years (6.7% of study participants).