Patients
Sixty children/adolescents of Sub-Saharan African or Caribbean ethnicity were prospectively included in the DrepaSympa trial.5Among them, 43 had subsequent PFTs as part of their routine follow-up (without DLNO measurement). These 43 participants are described in this retrospective study and the 17 non-included children are described in the online supplement. This study was approved by our local Ethics Committee (PHENOBS: N° 2018‐430). The parents were informed of the collection of the prospective data for research purposes and they could request that their child be exempted from this study in accordance with French law (non-interventional observational research).