I am conducting a study where the required sample size is 119. I am planning to take samples using simple random sampling. The query is: if a randomly selected sample does not give consent for the study, what should I do? Should I take more samples, to begin with or recruit more samples when some samples do not give consent?
You can continue collecting samples randomly until you reach the minimum sample size required for this study. I feel there is no harm in taking more number of samples.
I think you would have to increase the sample if you expect some patients will not consent
Thank you for your answers, Marla Sir and Pandis Sir.
So what should I write in the methodology?
For example " 10% more samples were recruited expecting that some randomly selected patients will not give consent".
Just increase the sample size based on your assumption of the % of eligible patients who will not consent
Dear Scholar Jamal Giri,
In my knowledge, you can write.....Based on sample size calculation, 119 participants will be enrolled in this study only after informed consent. This is because your one of the inclusion criteria should be...those who will able to provide informed consent.
WR,
Dr. Surya
http://bjhsnepal.org/index.php/editorial-board
Agree with Dr. Parajuli. You just have to mention that you will be collecting your sample from the desired number (119 in your case) which satisfy the inclusion criteria one of which is obtaining consent. That would sort out the need to make an assumption of how many will not give consent. You just have to continue collecting samples randomly till you complete your quota. ( You may have a time frame for that). Good luck.
In my opinion, depending upon the study it is good to mention the non-response rate. But in the other hand, it is also important to take additional sample before hand to reach the minimum sample size.
Regards,
GS
Respondent who dont consent are considered Non Responders. Adding a proportion of sample size to the required sample size anticipating a certain % of non response is advisable. Once your sampling frame is identified and your respondent is recruited, if you dont get a response then they are non responders.
So in methodology, if your sample calculated is 119 you may add upto 10-20% to this based on a rational to the 119 and get a final sample size for the study. Then you apply your SRS to recruit the respondents.
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