Factors Affecting Participant Dropout in Long-Term Aging Studies
Author Information
Author(s): Fiona E Matthews, Mark Chatfield, Carol Brayne
Primary Institution: Medical Research Council Cognitive Function and Ageing Study (MRC CFAS)
Hypothesis
Are factors previously seen as important for dropout at two-year follow-up also related to subsequent dropout?
Conclusion
Long-term follow-up studies will under-represent the disadvantaged and disabled but represent the full health status of participating individuals better.
Supporting Evidence
- Refusers tended to have poorer cognition and less education.
- Older individuals and those in worse health were more likely to move.
- Participants reported more health problems when they participated in multiple interviews.
Takeaway
This study looked at why people stop participating in long-term health studies. It found that those who drop out often have poorer health and education.
Methodology
The study used a population-based longitudinal design with structured interviews over ten years.
Potential Biases
Potential bias due to non-random dropout, particularly among disadvantaged groups.
Limitations
The study may not fully capture the reasons for dropout as reasons for refusal were only collected from year 6 onwards.
Participant Demographics
Participants were aged 65 and older, with a mix of social classes and educational backgrounds.
Statistical Information
P-Value
<0.0001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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