The aim of the China Diabetes Type 1 Study (CD1S) is to conduct a nationwide type 1 diabetes (T1D) registry study to investigate the demographic characteristics, metabolic control, complications occurrence as well as risk factors of patients with T1D, and to investigate the clinical features, complications' burdens and risk factors in pediatric adolescent patients with diabetes who had an age of onset <= 20 years.
The aim of the China Diabetes Type 1 Study (CD1S) is to conduct a nationwide type 1 diabetes (T1D) registry study in patients with T1D and in pediatric adolescent patients with diabetes who had an age of onset <= 20 years.~CD1S compromises a retrospective study enrolling inpatients hospitalized from Jan 1st, 2016 to Dec 31, 2021, and a prospective study beginning from the year 2022.