Clinical trial · Interventional
Nudging Preventive Screening Via Message Framing and Bundling
The Effect of Message Framing and Screening Bundling on Preventive Screening Engagement: A Randomized Field Experiment
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
This study is a randomized controlled field experiment embedded in the medical institution Early Diagnosis Program in Chile. Participants with two exams pending (a cancer screening test and a chronic disease test for diabetes and dyslipidemia) will be randomly assigned across a 3 × 3 factorial design: three message framing conditions (Basic, Risk/Importance, Peace of Mind) crossed with three exam-type conditions (cancer screening only, chronic disease test only, or both exams). Participants with only a cancer screening pending will be assigned to the 3 framing conditions and be encouraged to get the cancer screening. In both cases, participants are assigned to each experimental arm at twice the rate of an additional arm receiving the standard message currently used by the medical institution. This standard-message arm is included for operational purposes, is not part of the pre-specified analyses, and is thus not described in the "Arms and Intervention" section (or counted for "number of arms").
Conditions
Conditions (6)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Breast Neoplasms | Breast Neoplasm | ONTOLOGY_EXACT | 0.98 |
| Colorectal Neoplasms | Colorectal Neoplasm | ONTOLOGY_EXACT | 0.98 |
| Diabetes Mellitus | — | UNRESOLVED | — |
| Dyslipidemias | — | UNRESOLVED | — |
| Prostatic Neoplasms | Prostate Neoplasm | ALIAS | 0.90 |
| Uterine Cervical Neoplasms | Cervical Neoplasm | ALIAS | 0.90 |
Interventions
Interventions (9)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| Basic cancer screening message | Behavioral | — | UNRESOLVED |
| Basic chronic disease test message | Behavioral | — | UNRESOLVED |
| Basic combined message | Behavioral | — | UNRESOLVED |
| Peace of mind framing cancer screening message | Behavioral | — | UNRESOLVED |
| Peace of mind framing chronic disease test message | Behavioral | — | UNRESOLVED |
| Peace of mind framing combined message | Behavioral | — | UNRESOLVED |
| Risk framing cancer screening message | Behavioral | — | UNRESOLVED |
| Risk framing chronic disease test message | Behavioral |
Design
Arms and outcomes
Arms (9)
- type
- ACTIVE_COMPARATOR
- label
- Basic/Control × Cancer
- description
- Basic cancer screening message
- interventionNames
- Behavioral: Basic cancer screening message
- type
- ACTIVE_COMPARATOR
- label
- Basic/Control × chronic disease test
- description
- Basic chronic disease test message
- interventionNames
- Behavioral: Basic chronic disease test message
- type
- ACTIVE_COMPARATOR
- label
- Basic/Control × Both
- description
- Basic combined message
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 21 Years
- Maximum age
- 74 Years
Show eligibility criteria text
Inclusion Criteria: * Has at least one pending cancer screening (breast, colorectal, cervical, or prostate) within the contact window, as determined by the medical institution * Aged 21 to 74 years * Has a valid phone number on file * Eligibility is determined operationally before randomization (ex-ante) Exclusion Criteria: * Participants whose WhatsApp message was not successfully delivered, as reported by the third-party software used by the medical institution.
References
Publications (0)
Data not yet available