Table 1.
| Components of a text messaging intervention for weight loss
| Experimental condition | Texting Frequency | Motivational messaging | Reminders | Feedback type | Comparison unit |
|---|---|---|---|---|---|
| 1 | Weekly | Self-generated | One | Summary score | Self |
| 2 | Weekly | Self-generated | One | Summary score | Group |
| 3 | Weekly | Self-generated | One | Individual goal | Self |
| 4 | Weekly | Self-generated | One | Specific goal | Group |
| 5 | Weekly | Self-generated | Multiple | Summary score | Self |
| 6 | Weekly | Self-generated | Multiple | Summary score | Group |
| 7 | Weekly | Self-generated | Multiple | Individual goal | Self |
| 8 | Weekly | Self-generated | Multiple | Individual goal | Group |
| 9 | Weekly | Expert-generated | One | Summary score | Self |
| 10 | Weekly | Expert-generated | One | Summary score | Group |
| 11 | Weekly | Expert-generated | One | Individual goal | Self |
| 12 | Weekly | Expert-generated | One | Individual goal | Group |
| 13 | Weekly | Expert-generated | Multiple | Summary score | Self |
| 14 | Weekly | Expert-generated | Multiple | Summary score | Group |
| 15 | Weekly | Expert-generated | Multiple | Individual goal | Self |
| 16 | Weekly | Expert-generated | Multiple | Individual goal | Group |
| 17 | Daily | Self-generated | One | Summary score | Self |
| 18 | Daily | Self-generated | One | Summary score | Group |
| 19 | Daily | Self-generated | One | Individual goal | Self |
| 20 | Daily | Self-generated | One | Individual goal | Group |
| 21 | Daily | Self-generated | Multiple | Summary score | Self |
| 22 | Daily | Self-generated | Multiple | Summary score | Group |
| 23 | Daily | Self-generated | Multiple | Individual goal | Self |
| 24 | Daily | Self-generated | Multiple | Individual goal | Group |
| 25 | Daily | Expert-generated | One | Summary score | Self |
| 26 | Daily | Expert-generated | One | Summary score | Group |
| 27 | Daily | Expert-generated | One | Individual goal | Self |
| 28 | Daily | Expert-generated | One | Individual goal | Group |
| 29 | Daily | Expert-generated | Multiple | Summary score | Self |
| 30 | Daily | Expert-generated | Multiple | Summary score | Group |
| 31 | Daily | Expert-generated | Multiple | Individual goal | Self |
| 32 | Daily | Expert-generated | Multiple | Individual goal | Group |
See the Charge study description for more information. (clinicaltrials.gov: Charge: A Text Messaging-based Weight Loss Intervention. [https://ClinicalTrials.gov/show/NCT03254940; last accessed December 6 2018]).