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

Not Applicable

Completed

• Conditions: Surveys and Questionnaires; Noncommunicable Diseases

• Registration Number: NCT03768934
• Lead Sponsor: Johns Hopkins Bloomberg School of Public Health

Brief 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.

Study Timeline

• Study First Submitted: 2018-12-05
• Study First Submitted QC: 2018-12-06
• Study First Posted: 2018-12-07
• Study Start: 2019-02-19
• Primary Completion: 2019-04-26
• Study Completion: 2019-04-26
• Status Verified: 2020-08
• Last Update Submitted: 2020-08-07
• Last Update Posted: 2020-08-11

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 2151

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

Primary Outcome Measures

Name	Time	Method
Cooperate 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
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.
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.

Trial Locations

Locations (2)

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

Ifakara Health Institute; 🇹🇿 Dar Es Salaam, Tanzania