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

Not Applicable

Completed

• Conditions: Noncommunicable Diseases; Surveys and Questionnaires
• Interventions: Other: Lottery airtime incentive; Other: 1X airtime incentive; Other: 2X airtime incentive

• Registration Number: NCT03772470
• Lead Sponsor: Johns Hopkins Bloomberg School of Public Health

Brief Summary

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

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.

Study Timeline

• Study Start: 2018-08-09
• Primary Completion: 2018-11-13
• Study Completion: 2018-11-13
• Status Verified: 2018-12
• Study First Submitted: 2018-12-10
• Study First Submitted QC: 2018-12-10
• Last Update Submitted: 2018-12-10
• Study First Posted: 2018-12-11
• Last Update Posted: 2018-12-11

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 4723

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

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Lottery Incentive	Lottery airtime incentive	Lottery airtime incentive given to one in 20 participants
1X Incentive	1X airtime incentive	1X airtime incentive
2X incentive	2X airtime incentive	2X airtime incentive

Primary Outcome Measures

Name	Time	Method
Cooperation Rate #1	Through study completion, an average of one month	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.
Response Rate #4	Through study completion, an average of one month	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

Secondary Outcome Measures

Name	Time	Method
Refusal Rate #2	Through study completion, an average of one month	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
Contact Rate #2	Through study completion, an average of one month	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

Trial Locations

Locations (2)

Instituto de Salud Publica Pontificia Universidad Javeriana; 🇨🇴 Bogota, D.c., Colombia

Ifakara Health Institute; 🇹🇿 Dar Es Salaam, Tanzania