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

Johns Hopkins Bloomberg School of Public Health

Status: Completed

Conditions: Noncommunicable Diseases; Surveys and Questionnaires

Treatments: Other: 1X airtime incentive; Other: Lottery airtime incentive; Other: 2X airtime Incentive

Study type: Interventional

Funder types: Other

Identifiers

NCT03768934

00007318-4.2

Details and patient eligibility

About

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.

Full 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.

Enrollment: 2,151 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Access to a mobile phone
• Greater or equal to 18 years of age
• In Colombia, conversant in the Spanish language. In Tanzania, conversant in the Swahili language.

Exclusion criteria

• Less than 18 years of age

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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2,151 participants in 4 patient groups

Control

No Intervention group

Description:

No airtime incentive for completing the survey

1X Incentive

Experimental group

Description:

1X airtime incentive

Treatment:

Other: 1X airtime incentive

2X incentive

Experimental group

Description:

2X airtime incentive

Treatment:

Other: 2X airtime Incentive

Lottery Incentive

Experimental group

Description:

Lottery airtime incentive where odds of winning lottery are 1 out of 20

Treatment:

Other: Lottery airtime incentive