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Charge: A Text Messaging-base...

Charge: A Text Messaging-based Weight Loss Intervention

Last Updated: 2025-04-10

Study Results

Results available

Outcome measurements, participant flow, baseline characteristics, and adverse events have been published for this study.

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

Total Enrollment

534 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-01-31

Study Completion Date

2023-01-31

Brief Summary

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This study evaluates different versions of a text messaging-based app for weight loss. This study will place participants to 1 of 32 experimental conditions that reflect different texting components and levels. Participants will be randomized to a condition. The investigators will recruit 448 adults into a 6-month weight loss program, with an additional follow-up 6-months after the intervention ends.

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Detailed Description

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Standalone text messaging-based weight loss treatments are scalable and can achieve population reach. However, these interventions are also modular; they can be delivered independently to maximize cost-effectiveness or combined with other approaches (e.g. provider counseling) to maximize outcomes. This study is a 12-month experimental trial among 448 adults with obesity. All participants will receive a core 6-month weight loss texting intervention that includes tailored behavior change goals, interactive self-monitoring, automated feedback, and skills training. Participants will be randomly assigned to 1 of 32 different experimental conditions.

Conditions

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Weight Loss Obesity

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

FACTORIAL

The investigators will use a full factorial design to randomize participants to experimental conditions that reflect the texting intervention components: motivational messaging (self- vs expert-generated), texting frequency (daily vs weekly), reminders (one reminder v. multiple reminders), feedback type (summary score v. specific feedback) and comparison unit (to self v. to a group of people). The full factorial design is power efficient, logistically feasible (because we manipulate conditions using technology) and will allow the investigators to examine the most important main and interaction effects among components.

Primary Study Purpose

TREATMENT

Blinding Strategy

SINGLE

Investigators

Study Groups

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Arm 1: WT-SM-OR-SS-CS

Charge: weekly tracking, self-generated motivational messages, one reminder, summary score, compare to self

Group Type EXPERIMENTAL