Introduction: Data regarding efficacy of second-generation basal insulins (BI) using continuous glucose monitoring (CGM) come from clinical trials. We evaluated the effectiveness of insulin glargine 300 U/ml (Gla-300) compared to insulin degludec 100 U/ml (IDeg-100) in terms of percentage of time in range (TIR); 70-180 mg/dl was obtained from CGM in suboptimally controlled patients with type 1 diabetes (T1D) in routine clinical practice. Methods: This observational, multicenter, cross-sectional study included patients with T1D ([ 3 years diabetes duration, HbA 1c C 7.5%) who had switched from first-generation BI to Gla-300/IDeg-100 within the past 24 months according to physician discretion. Clinical and laboratory data were obtained from
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