The incidence of type 1 diabetes is still increasing in the Netherlands, but has stabilised in children under five (Young DUDEs-1).

AIM: This study described the incidence and prevalence of type 1 diabetes in children in the Netherlands in 2010-2011 and to compare these results with earlier studies. METHODS: This was a retrospective nationwide cohort study of Dutch children aged 14 years or younger. Patients were identified using health insurance reimbursement registries for hospital care and invoices for insulin. In the Netherlands, all children with diabetes are treated by hospital-based paediatricians and health care for all Dutch citizens is covered by law. RESULTS: The incidence of type 1 diabetes almost doubled between 1978-1980 and 2010-2011, from 11.1 to 21.4 per 100 000. In the youngest age group, who were under 5 years, the incidence rate doubled between 1996 and 1999 and remained stable after that. There were no relevant incidence differences between the sexes. The overall prevalence of type 1 diabetes in the Netherlands during 2009-2011 was 143.6 (95% confidence interval 141.1-146.2) per 100 000 children and was similar for boys and girls. CONCLUSION: The incidence of type 1 diabetes in children in the Netherlands almost doubled between 1978-1980 and 2010-2011, but the incidence in children under 5 years appeared to stabilise between 1996 and 1999. There were no statistical differences between the sexes.

The structure of effortful control in preschoolers and its relation to externalizing problems.

The first aim of the present study was to examine the structure of effortful control. The second aim was to determine whether components of effortful control relate to conduct problems and hyperactivity. Effortful control was measured in 3-year-old children (N= 89) with an observational measure, the effortful control battery (ECB), and a parent report, the Children's Behaviour Questionnaire (CBQ). Principal component analysis showed that the ECB measures five components, assessing two higher-order constructs, which can be labelled as Self-Control and Attention/Motor Control. The five scales of the CBQ appeared to measure one construct - a more general measure of effortful control. The components and constructs of the ECB as well as the scales of the CBQ were differently related to conduct problems and hyperactivity. Conduct problems were most strongly predicted by observed Delay of Gratification and parent-reported Inhibitory Control, whereas Hyperactivity was most strongly predicted by observed Delay of Gratification, and the higher-order construct Attention/Motor Control, as well as parent-reported Attentional Focusing and Inhibitory Control. It is important to keep in mind that effortful control is composed of heterogeneous components, all having their own unique values.