If we focus on the most common MODY genes GCK, HNF1A and HNF4A, the prevalence in both our study (4%) and the Norwegian study (6%) is lower than the 15% seen in the Swedish National Cohort [3], likely explained by the latter including patients with all types of diabetes from paediatric clinics, with age at diagnosis of up to 18 years. Here, HNF1A is linked to diabetes mellitus.