BACKGROUND: Some asthmatic @entity1 living in mountain areas experience significant improvement in daily symptoms and in the degree of @entity2488 . The aim of this study is to investigate the effect of altitude on the prevalence and morbidity of childhood @entity565 . METHODS: A questionnaire regarding the history and symptoms of @entity565 was distributed to 874 @entity1 aged 6-12 years, to be completed by their parents with the help of their pediatrician. A total of 583 @entity1 lived at @entity7885 level, 180 at an altitude between 501 and 800 meters, and 111 at an altitude between 801 and 1,200 meters. All @entity1 with recurrent cough, shortness of breath, wheezing, and a history of @entity565 were considered to have @entity565 . RESULTS: The prevalence of childhood @entity565 in the mountains (800-1,200 meters) was twice as low as that at @entity7885 level (15.8% of @entity1 ) (p <0.01). Parental smoking was more frequent in @entity1 who lived at @entity7885 level than in the mountains. Additionally, consumption of fish and oranges was more frequent at @entity7885 level. @entity1 with @entity565 who lived in the mountains were absent fewer days from school per year (0.2) and had fewer nights with @entity1353 per year (0.5) than asthmatic @entity1 who lived at @entity7885 level (1.6 days and 25 nights, respectively). CONCLUSIONS: @entity565 in @entity1 who live at high altitudes is characterized by low prevalence and low morbidity.

The influence of altitude in XXXX .

@entity1 :: ('9606', 'Species') :: ['children', 'Children'] @entity1353 :: ('MESH:D004417', 'Disease') :: ['dyspnea'] @entity2488 :: ('MESH:D001982', 'Disease') :: ['bronchial obstruction'] @entity565 :: ('MESH:D001249', 'Disease') :: ['Bronchial asthma', 'asthma', 'bronchial asthma'] @entity7885 :: ('6395', 'Gene') :: ['sea']
@entity565 :: (MESH:D001249,Disease) :: ['bronchial asthma']
