Successful Follow-Up Methods in a Thai Cohort Study
Author Information
Author(s): Seubsman Sam-ang, Kelly Matthew, Sleigh Adrian, Peungson Janya, Chokkanapitak Jaruwan, Vilainerun Duangkae
Primary Institution: Thai Health Promotion Centre, Sukhothai Thammathirat Open University
Hypothesis
What methods can ensure a high response rate in a national cohort study in Thailand?
Conclusion
The study achieved a 71% response rate after implementing various effective follow-up methods.
Supporting Evidence
- Initial follow-up generated a response rate of about 48%.
- After 4 rounds of telephone contact and mail-outs, the overall response rate reached just over 71%.
- The total cost per respondent was approximately US$4.06.
Takeaway
The researchers found that using phone calls, sending reminders, and offering small prizes helped them get more people to respond to their health survey.
Methodology
The study involved sending questionnaires to a cohort of 200,000 students, followed by multiple rounds of mail-outs and phone calls to encourage responses.
Potential Biases
There is a risk of non-responder bias, as younger individuals and those with lower income were less likely to respond.
Limitations
The study faced challenges with non-responder bias, particularly among younger age groups and lower income individuals.
Participant Demographics
Participants were distance learning students from Sukhothai Thammathirat Open University, representing a diverse demographic across Thailand.
Digital Object Identifier (DOI)
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