What is the best/ common method to estimate dropout rate in community base studies?
What is the best method for Adjusting Sample Size for Anticipated Dropouts in cross sectional studies?
There are no drop out rates in cross-sectional studies. It's called non-response rates. Respondent can refuse to respond either to whole survey or certain questions. Cross-sectional is a one shot survey which reflect scenario at that specific time. Non-response rates depends upon what information you are seeking. In a non-sensitive infromation it is usaully taken 5-10%. You may also increase upto 20% if you think the collected information is very sensitive and people will not like to answer.
Drop out rates are in case-control or intervention-based design or even longitudinal surveys. The respondent is followed for a specific period of time or certain event and may drop out of the study for any reason.
"In a non-sensitive information it is usually taken 5-10%. You may also increase upto 20% if you think the collected information is very sensitive and people will not like to answer."??? Any evidence?
Evidence must come from your own research areas. I work with community-based research with focus on maternal and child health, we take 10% non response rate in cross section surveys. In case control or intervention studies this may go up because there are many ways drop out can happen. It also depend on resources as well (Time and cost etc.).
Drop outs in a longitudinal study mean that you will have right censored data, so depending on what exact question you are investigating, it may be useful to apply methods used for survival analysis (Kaplan-Meier, Cox regression etc.) rather than discarding censored data points.
Dear Ramadan Elkalmi
Drop out usually in longitudinal study
You could minimized it by shortening the time of follow up and best care too
Dear Ishag Adam.,
Thanks very much for your answer ., I will accept your feedback with reservation. Because your proposal can not be applied for studies where the out come need long time to be observed or in case of rare diseases ... you are welcome
Use Kaplan Meyer techniques. It is akin to death of anyone of your study participants. Please visit my page at olalereshittu.wordpress.com
Thank you all for the response. A collection of answers will serve my purpose.
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