| Outcome Measures: |
Primary: Percent time in euglycemia (BG 70 to 180 mg/dl) by CGM, Percent time in euglycemia (BG 70 to 180 mg/dl) by CGM during the final 14 days of each treatment period during steady state (with basal insulin delivery as either one daily injection of insulin degludec or as insulin aspart via CSII), 46 weeks | Secondary: Standard Deviation (SD) of blood glucose by CGM for two week period, SD of interstitial fluid glucose by CGM for 2 week period during each basal insulin delivery method. (Note: because the Dexcom Platinum G5 CGM is currently only FDA approved for 7 days of use, two contiguous CGM periods using 2 sensors, each for 7 days, will be performed to capture 2 weeks of continuous CGM data.) Dexcom G6 is approved by FDA for 10 days of use so 2 sensors will be used during the CGM periods., 46 weeks|SD of blood glucose by CGM during the nocturnal period, SD of blood glucose by CGM during the nocturnal period (midnight to 6 am) during each basal insulin delivery method, 46 weeks|Percent time in hypoglycemia by CGM, Percent time in hypoglycemia by CGM, captured at 2 levels of hypoglycemia: BG \< 54 mg/dl (level 2) and BG 55-69 mg/dl (level 1), for each basal insulin treatment., 46 weeks|Percent time in normoglycemia, Percent time in normoglycemia (BG 70 to 140 mg/dl) by CGM during each basal treatment period., 46 weeks|Time to recovery from level 2 hypoglycemia, Time to recovery from level 2 hypoglycemia (BG \>70 with resolution of symptoms) on each treatment. If a second event (BG \< 70 mg/dl) occurs within 60 minutes of a previous hypoglycemic event, this will be considered part of the same hypoglycemic episode., 46 weeks|Patient satisfaction, Patient satisfaction by TRIM-D questionnaires with each basal insulin treatment., 46 weeks|Patient satisfaction, Patient satisfaction by TRIM-DD questionnaires with each basal insulin treatment., 46 weeks|HbA1c, HbA1c after 20 weeks of each basal insulin treatment., 46 weeks|Total daily insulin dosage, Total daily insulin dose, total basal insulin dose, and total bolus insulin dose on each treatment., 46 weeks
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