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Completed

NCT Number: NCT03768934

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

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.

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Key information

Conditions

Surveys and Questionnaires Disease Attributes Noncommunicable Diseases Pathologic Processes Pathological Conditions, Signs and Symptoms

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Instituto de Salud Publica Pontificia Universidad Javeriana, Bogotá, D.C., Colombia

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About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

1X airtime incentive

Other

An incentive given in the form of airtime.

2X airtime incentive

Other

An incentive given in the form of airtime.

Lottery airtime incentive

Other

An incentive given in the form of airtime.

Primary outcomes

  1. Cooperate Rate #1

    Time frame: 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.

  2. Response Rate #4

    Time frame: 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 outcomes

  1. Refusal Rate #2

    Time frame: 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.

  2. Contact Rate #2

    Time frame: 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.

Sponsors and collaborators

Lead sponsor

Johns Hopkins Bloomberg School of Public Health

Other

Collaborators

  • Ifakara Health Institute
  • Pontificia Universidad Javeriana
  • The Bloomberg Family Foundation, Inc.

Registry information

Official study title

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

Important dates

Study start
2019
Primary completion
2019
Study completion
2019
First posted
Dec 7, 2018
Registry last updated
Aug 11, 2020

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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