Use of Airtime Amounts to Improve Interactive Voice Response Surveys in Colombia and Tanzania

Study Overview
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Brief Summary
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This study evaluates the effect of three different airtime incentive amounts on interactive voice response (IVR) survey cooperation, response, refusal and contact rates, as compared to control group, in Colombia and Tanzania.

Detailed Description
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Using random digit dialing (RDD) sampling technique, participants were randomized one of four airtime incentive amounts contingent on them completing the noncommunicable disease risk factor survey. This mobile phone survey will be sent as an interactive voice response (IVR). In IVR surveys, participants use their touch tone key pad to answer pre-recorded questions. (i.e. If you are male, pres 1; If you are female, press 2). This study will be conducted in both Colombia and Tanzania.

Official Title
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A Randomized Controlled Trial of Varying Airtime Amounts to Improve Interactive Voice Response (IVR) Survey Performance in Colombia and Tanzania

Conditions
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Surveys and Questionnaires, Noncommunicable Diseases

Intervention / Treatment
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* Other: 1X airtime incentive
* Other: 2X airtime incentive
* Other: Lottery airtime incentive


Participation Criteria
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Eligibility Criteria
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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

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Participants will be randomized to one of four airtime incentive amounts: 1) no incentive; 2) 1X incentive; 3) 2X incentive or 4) a lottery incentive, in which one out of every 20 participants will receive the incentive. Airtime incentives were sent if participants completed the noncommunicable disease risk factor survey.
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| No Intervention: Control<br>No airtime incentive was given for completing the survey | |
| Experimental: 1X Incentive<br>1X airtime incentive | Other: 1X airtime incentive<br>* An incentive given in the form of airtime<br>|
| Experimental: 2X incentive<br>2X airtime incentive | Other: 2X airtime incentive<br>* An incentive given in the form of airtime<br>|
| Experimental: Lottery Incentive<br>Lottery airtime incentive given to one in 20 participants | Other: Lottery airtime incentive<br>* An incentive given in the form of airtime<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cooperation Rate #1 | As defined by American Association for Public Opinion Research, cooperation rate is defined as I/(I+P+R) where I is complete interviews, P is partial interviews, and R is refusals and breakoffs. | Through study completion, an average of one month | 
| Response Rate #4 | As defined by American Association for Public Opinion Research, response rate is defined as (I+P)/(I+P+R+eU) where I is complete interviews, P is partial interviews, R is refusals and breakoffs, and eU is the estimated eligible proportion of unknowns | Through study completion, an average of one month | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Refusal Rate #2 | As defined by American Association for Public Opinion Research, refusal rate is defined as (R)/(I+P+R+eU) where R is refusals and breakoffs, I is complete interviews, P is partial interviews, and eU is the estimated eligible proportion of unknowns | Through study completion, an average of one month | 
| Contact Rate #2 | As defined by American Association for Public Opinion Research, contact rate is defined as (I+P+R)/(I+P+R+eU) where I is complete interviews, P is partial interviews, R is refusals and breakoffs, and eU is the estimated eligible proportion of unknowns | Through study completion, an average of one month | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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mobile phone surveys, interactive voice response, incentive