A Reinforcement Approach to Increase Use of CGM

The purpose of this pilot project is to evaluate the effectiveness of a behavioral economic
intervention to increase use of continuous glucose monitors (CGM) in adolescents and young
adults with T1D. This study will be done in conjunction with Nancy Petry, PhD and her
research team at University of Connecticut School of Medicine (UConn Health). The
intervention will reinforce patients for wearing CGM and for uploading it and reviewing its
data. A 6-month pilot trial will be conducted with up to 20 patients receiving the
intervention. The specific aims are:

1. To estimate how well a reinforcement intervention increases usage of CGM. The proportion
of days on which participants wear the CGM will be determined as well as the number of
weeks during which CGM is worn at least 5 days. We will compare usage rates in the pilot
trial to historical control data of patients initiating CGM.

2. To evaluate the association between CGM usage and A1c. We expect A1c will decrease over
time in patients who receive the reinforcement intervention. Patients who continue using
the CGM are expected to have greater decreases in A1c than patients who discontinue its
usage.

Evaluations will be conducted at time of CGM initiation, and 6, 13, 19, 26, and 39 weeks
after treatment initiation to assess effects of the intervention and estimate effect sizes.

In addition to the primary aims, secondary outcomes will also be evaluated. Continued use of
CGM is expected to improve aspects of diabetes management and daily functioning. Predictors
of continued CGM usage and improvements in A1c will also be evaluated.

Results from this pilot study will be instrumental for guiding a subsequent, larger and
longer term randomized study for evaluating reinforcement interventions for improving uptake
of CGM, other diabetes-related adherence behaviors, and long-term outcomes.

Inclusion Criteria:

1. age 13-26 years old;

2. diagnosis of type 1 diabetes (T1D) >12 months via ADA guidelines

3. average A1c >7.5% and <14% during the year before study entry, and most recent A1c
>7.5% but <14%;

4. have ordered and received a CGM, but have not used a CGM >3 days a week on average
during the past 6 months.

5. test blood glucose levels at least 2 times per day on average;

6. access to a computer with internet for uploading CGM data;

7. access to a cell phone to communicate with research staff;

8. English speaking, able to read at >5th grade level, and pass an informed consent quiz;
and adequate knowledge of insulin dosing and dietary recommendations for managing T1D.

Exclusion Criteria:

1. have a major psychiatric or neurocognitive disorder (e.g., severe learning impairment)
that would inhibit participation;

2. have a major visual impairment;

3. have a significant other medical condition that impacts diabetes management (e.g.,
rheumatoid arthritis, or other condition that requires steroid treatment);

4. plan to switch insulin delivery mode (injection to pump or vice versa) in the next 12
months, or have recently switched.

5. Fail to complete the baseline phase wearing the CGM.