Noncommunicable Diseases, Surveys and Questionnaires
Conditions
Keywords
mobile phone surveys, short message service, incentive
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.
Interventions
OTHER1X airtime incentive
An incentive given in the form of airtime.
OTHER2X airtime Incentive
An incentive given in the form of airtime.
An incentive given in the form of airtime.
Sponsors
The Bloomberg Family Foundation, Inc.
Ifakara Health Institute
Pontificia Universidad Javeriana
Johns Hopkins Bloomberg School of Public Health
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
SINGLE (Outcomes Assessor)
Intervention model description
Participants will be randomized to one of four airtime 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.
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| 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
| Measure | Time frame | Description |
|---|---|---|
| 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. |
Countries
Colombia, Tanzania
Outcome results
None listed