Strategies to Enhance New CGM Use in Early Childhood (SENCE)

Although prior studies have not demonstrated that continuous glucose monitoring (CGM) use
results in improved glycemic control in children <8 years of age, many of the barriers to CGM
efficacy in this age group may have been due to problems in the wearability and accuracy of
prior generation devices, as well as to the setting of glycemic targets aimed primarily at
preventing hypoglycemia at all costs. There may also be behavioral barriers to consistent and
effective CGM use in this age range. The goal of this study is to assess the impact of CGM
alone and CGM combined with a family behavioral intervention focused on supporting CGM use on
glycemic control in very young children with T1D compared with usual care without CGM.

Inclusion Criteria:

1. Clinical diagnosis of insulin dependent presumed autoimmune type 1 diabetes by the
investigator

2. Age 2-<8 years at consent

3. Diabetes duration ≥ 6 months

4. Total daily insulin ≥ 0.3 units per kg per day

5. HbA1c 7.0% to <10.0% (Point of care device or local lab measured within 30 days of
screening visit used to assess eligibility)

6. No use of unblinded personal CGM, outside of a research study, as part of real-time
diabetes management in the last 30 days

7. Insulin regimen involves either use of a consistent insulin regimen with an insulin
pump in the last 3 months or at least 3 multiple daily injections of basal and bolus
(meal time) analogue insulin in the last 3 months (e.g. no change from injections to
pump or vice versa in the last 3 months), with no plans to switch the modality of
insulin administration during the next 6 months (e.g., injection user switching to a
pump, pump user switching to injections).

8. Perform at least 3 blood glucose meter checks per day from self-report at screening
and meter download during blinded CGM run in

9. Not currently using and no plans to begin non-insulin medication for blood glucose
lowering during the course of the study

10. Parent or guardian comprehend written and spoken English (This requirement is due to
the fact that the questionnaires to be used as outcome measures do not have validated
versions in other languages, and interventions will be delivered in English only for
the RCT to ensure standardization/fidelity checks across sites).

11. Parent understands the study protocol and agrees to it

12. No expectation that participant/parent will be moving out of the area of the clinical
center during the next 12 months, unless the move will be to an area served by another
study center.

Exclusion Criteria:

1. Use of unblinded personal CGM, outside of a research study, as part of real-time
diabetes management in the last 30 days

2. Unable to use CGM device for minimum number of hours during blinded run-in period or
skin reaction from adhesive that would preclude participation in the randomized trial

3. The presence of a significant medical disorder or use of a medication such as
oral/inhaled glucocorticoids that in the judgment of the investigator will affect the
wearing of the sensors or the completion of any aspect of the protocol.

4. More than 1 episode of SH or DKA in the past 6 months (not including DKA at time of
dx).

5. The presence of any of the following diseases:

- Asthma if treated with systemic or daily inhaled corticosteroids in the last 6
months (Intermittent treatment with inhaled corticosteroids does not exclude
subjects from enrollment)

- Cystic fibrosis (Adequately treated thyroid disease and celiac disease do not
exclude subjects from enrollment)

6. Inpatient psychiatric treatment in the past 6 months for either child participant or
the primary care giver

7. Need for use of acetaminophen or acetaminophen-containing products on a regular basis
during the 6 months of the trial

8. Participation of parent or child in a diabetes related intervention study in past 6
weeks.

9. Any medical, psychological or social situation where per investigator discretion it
may be difficult for family or child to participate fully in the intervention

10. Another member of the same household is participating in this study.