Objective:

To describe 6-month program persistence and percentage weight change among patients prescribed tirzepatide through an Australian digital weight loss service, comparing patients who participated in a peer referral program with those who did not.

Approach:

• Study Design: Retrospective cohort analysis of deidentified records from the Juniper digital weight loss service data repository.
• Cohort Definition: Patients were classified as referred or nonreferred according to recorded participation in the peer referral program.
• Outcome Definitions: Medication adherence was defined as at least five medication orders. Per-protocol persistence required at least one verified weight entry. These measures should not be interpreted as confirmation of medication use or continuous treatment.
• Statistical Analysis: Propensity score matching was used to compare weight outcomes between groups. Matching can address measured differences but does not establish causality or eliminate residual confounding.

Key Findings:

• Overall, 27.6% of patients met the study’s 6-month adherence criteria.
• Medication adherence, as defined by the study, was 48% among referred patients and 42% among nonreferred patients.
• Mean recorded weight loss was 16.2% among referred patients and 14.1% among matched nonreferred patients.
• These are observational associations and do not show that referral participation caused greater adherence or weight loss. Results apply to the analyzed cohort and may not generalize to other populations or services.

Limitations:

• The retrospective design and use of deidentified service records limit the ability to assess unmeasured factors and verify individual treatment experiences.
• Referral participation was not randomized, so differences between groups may reflect factors other than the referral program.
• The referral program did not include in-app chat or a peer-support group; findings should not be interpreted as evidence about those interventions.
• The reported adherence and persistence measures are operational definitions based on orders and weight entries, not direct measures of medication-taking behavior or uninterrupted treatment.

Conclusion:

In this retrospective cohort, participation in the peer referral program was associated with higher study-defined medication adherence and greater mean recorded weight loss at 6 months. Because the analysis was observational and the outcome measures were based on service records, these findings do not establish that referral participation caused the differences.

Sources:

• Peer Referral Pathways and 6-Month Outcomes in a Tirzepatide-Supported Digital Weight Loss Service: Retrospective Cohort Study