NCT03768934

Use of Airtime Incentives to Improve Short Message Service Surveys in Colombia and Tanzania

A Randomized Controlled Trial of Airtime Incentives to Improve Short Message Service (SMS) Survey Performance in Colombia and Tanzania

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 2,151 (actual)
• Sponsor: Johns Hopkins Bloomberg School of Public Health · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Accepted

Summary

This study evaluates the effect of four different airtime incentive amounts on short message service (SMS) survey cooperation, response, refusal and contact rates, as compared to control group, in Colombia and Tanzania.

Detailed description

Using random digit dialing (RDD) sampling technique, participants were randomized to one of four airtime incentive amounts contingent on them completing the noncommunicable disease risk factor survey. This mobile phone survey will be sent as a short message service (SMS). In SMS surveys, participants use their touch tone key pad to answer written questions. (i.e. If you are male, press 1; If you are female, press 2). This study will be conducted in both Colombia and Tanzania.

Conditions

• Surveys and Questionnaires
• Noncommunicable Diseases

Interventions

Type	Name	Description
OTHER	1X airtime incentive	An incentive given in the form of airtime.
OTHER	2X airtime Incentive	An incentive given in the form of airtime.
OTHER	Lottery airtime incentive	An incentive given in the form of airtime.

Timeline

• Start date: 2019-02-19
• Primary completion: 2019-04-26
• Completion: 2019-04-26
• First posted: 2018-12-07
• Last updated: 2020-08-11

Locations

2 sites across 2 countries: Colombia, Tanzania