In this study, we aimed to examine the followings: (1) to determine the variability of BD/TDD ratios according to age groups, insulin treatment modality, and diabetes technologies; and (2) to determine the association of BD/TDD ratio with glycemic outcome and body mass index (BMI) from the Better Control in Pediatric and Adolescent Diabetes: Working to Create Centers of Reference (SWEET) registry. Here, INS is linked to diabetes mellitus.