Key Message
Only one study has demonstrated that asthmatic children can exhibit a loss of lung function during childhood based on spirometry, in a therapeutic trial (CAMP study). This result deserved to be confirmed in an out-of-hospital setting. We show that tracking of function was observed in 68.8% of the children, while 27.8% showed a loss of function and 3.4% showed a gain in function. We thus confirm the results of the CAMP study.