Classification of data on microvascular complications
retinopathy, macroalbuminuria, albuminuria
RETINOPATHY, PROLIFERATIVE
Creatinine was handled as a continuous variable for the purpose of validation and was not processed further. For albuminuria, categorization of EHR data was made based on the following algorithm: normal was defined as UACR<3 mg/mmol; microalbuminuria was defined as an incident UACR of 3–30 mg/mmol; macroalbuminuria as an incident UACR >30 mg/mmol. Due to lack of impact for the SMARTEST study, no differentiation was made between no albuminuria and normalized albuminuria (after treatment) which were merged into the same category. For NDR data, the reported albuminuria grade or the transformed albuminuria grade, based on the numerical UACR and by the same algorithm as for EHR data, was utilized. In cases where both an albuminuria grade and a numerical value had been entered; supremacy was considered for the numerical value.For foot-at-risk, guidelines from the NDR and the Swedish Association of Local Authorities and RegionsRetinopathy status (yes/no) was based on the fundus examination in EHR and on the retinopathy status and grade variables in the NDR. The retinopathy grades (mild, moderate, severe and proliferative) provided in the fundus examination of EHR and the NDR were utilized without further processing.