Study population
The data of children followed for asthma in the Pediatric Pneumology and Allergology Department of the Necker-Enfants Malades Hospital between June 2013 and February 2021 who were tested for HVS were retrospectively analyzed. These children were identified using Dr Warehouse software24, which allowed a search by keywords present in the computerized medical reports. The keywords or keyword combinations used to identify the patients were: ”hyperventilation syndrome and asthma”, ”hyperventilation test and asthma”, ”Nijmegen and asthma”, ”hyperventilation test”, ” hyperventilation”, “hyperventilation and asthma”. Non-asthmatic patients and those for whom the lack of data did not allow a classification according to the GINA and an assessment of asthma control were excluded from the analysis.