I have a study with cases occult hepatitis B ( P: 10℅) , controls 1 , chronic HBV (P: 8,2℅), negative control ( without viral hepatitis) How can I calculate the sample size
Dr Khadija will need a minimum of 230 fleiss w/cc I.e 58 cases and 172 control.she will a minimum of 230 sample size.Thank you so much sir,so interesting and succinct.
Great question. Unfortunately Epi Info mobile doesn’t have a module for Matched Case control studies. I will cover another tool that can do that soon. Please stay tuned 😊
its a nice presentation. can we use only one research finding to get a percent of control exposure and odds ratio? how can we calculate sample size if there are different associated factors for our case in different literature? please respond to me
Great question. Yes you can use only one research to get the elements needed to calculate the sample size. And if there are different studies you can use the study that gives you the largest sample size. If there are different associated factors, calculate for all the associated factors and use the one that gives you the largest sample size. If the data is from different populations in different regions, use the one for your region or that is closest to your region. I hope this helps?
@@EpiInfoforRookiesE4Rcan I do a comparative cross sectional study for two groups with different sample size? And also my thesis is to compare effect of anesthesia method(general and spinal) on apgar score of neonates. What do u advice me? Thank you so much for replying back to my comment 😊
With the following variables: Study design[unmatched case control study] Confidence level[99.9%] Power of study[90%] Ratio of control[3:1] Level of exposure for Contol[120/408 exposed converted to 29.4%] Odd ratio was given as[4.5] Level of exposure for cases[ The odd ratio actually helps us to get it, when inputed] Using Fleiss w/cc Cases-55 Control-163 Total-218 the above is the minimum sample size needed for the study.
I am planning to conduct study about risk factors of recurrent stroke.I have previous study with results in percentage but epiinfo needs odds ratio. How can I calculate sample size
Great question Salu! What kind of study are you trying to conduct? If it is a case control study, you can either enter the percent of controls exposed and the Odds ratio or the percentage of cases with exposure. If you enter the percent of cases with exposure , the odds ratio will be computed immediately. I hope this helps?
I got this result using Fleiss w/cc in epi info : cases 29 and controls 87 and a total of 116 , but I couldn’t change the confident level to 90% … is that ok ?
I have one question. I noticed that epi info can’t calculate everything e.g: matched case- control or matched cohort. Does this mean that StatsDirect on a laptop is better?
Hi Daniel, in order to publish to the web, you will need to have your own web server. Check out how to do it here www.cdc.gov/epiinfo/user-guide/survey/introduction.html. I hope this helps?
Good morning sir Thank you for the lecture sir. I tried downloading epiinfo app but was unable to as they said my phone is beyond loading the app What should I do sir.please Thank you sir
Hi Rabi, you would need to download the APK file from the internet as the play store is currently not supporting Epi Info for Android. You can check the description section of this video th-cam.com/video/Eryj1eQDPsg/w-d-xo.htmlsi=qzec24cTaiyRH680 to download the APK. I hope this helps?
Good morning doc, please you may need to guide me. I have here cases to be 55, control= 163 and total sample size at 218. I use 30% as my percentage of controls exposed. thank you
So from the the question, if 120 out of 400 have consumed a lot of fries, the percentage control exposed will be 120/400*100 = 30%. I wouldn't know if I am right
Hi Brenda, Epi info can only be used for unmatched case control study sample size calculations. But you can use this tool here shiny.vet.unimelb.edu.au/epi/sample.size.mccs/. I will be making a video about using it soon so please stay tuned ☺️
Great question Wahyu! If you don’t have the odds ratio from a previous study, you can use the hypothetical percentage of exposure among the cases and control. This can be based on previous studies or advise of an expert in the field that you are studying. I hope this helps?
Great question Maha. These are values that are set by the researcher. If you want your results to be more accurate then you increase the level of confidence as well as the power. Naturally when you increase any of the two the sample size will increase. Typically researchers use a confidence level of 95% and a power of 80% for observational studies and 99% and 90% for experimental studies. I hope this helps?
Great question! You will need to do a pilot study or you can use values based on the experience of a learned scientist in the field you are studying. I hope this helps?
Wow user friendly TH-cam lectures. Thank you sir.
Sample size as calculated with Fleiss w/CC:
Cases- 55
Controls163
Total- 218
Thanks for your feedback. 👍
i got the same answer. please is it correct?
Thank u sir for the lesson.
For Dr kadija sampling using fleiss w/cc
Case:55
Control:163
Total: 218
Nice one 👍
Great job!
Fleiss w/CC
Cases: 55
Control:163
Total: 218
Rukayat 🙌
Straight to the point for mentoring others. I have gained a lot, sir
Thank you for your feedback sir Emmanuel 🙌
Thank you sir for the great video
Using fleiss w/CC cases -29 control-87 and total 116
Great job
Thank you so much for this insightful tutorial.
Sample size will be : 218
Using Fleiss W/CC
Cases: 55
Control: 163
Total: 218
Nice work!
I always can't wait for your captivating tutorials... Just see how easy you have made this look. Thanks as usual
You are very welcome sir 🙌
A lot of value! Thank you so much! Wow ❤
You're so welcome!
Great one sir
Thank you Joel
It's very comprehendible and easy to relate to your respective study. thank you so much
I appreciate your feedback Ammarah 🙌
Great one Sir
Thank you sir 👍
Very interesting class
Glad you found it useful 👍
Thank you for sharing Sir
🙌
Thank you too Martha
Thank you sir for the tutorials
Cases : 585
Control: 1754
Total: 2339
Fleiss wt cc
🤔
This is good for us beginners. Thanks prof
Yes, it’s beginner friendly 😃
You are a really great tutor ❤❤❤❤
Thank you Mubarak ☺️
Excellent presentation 👏 👌 Keep it up
Thank you so much Gemechis 😊
Awesome! Using the Fleiss w/cc Cases 326, Controls 978, Total 1304. Easy pessy
Nice work Chisara
Thank you very much Dr, what if I have one case, and two different controls?
Very comprehensive sir
Thank you so much Chief Zakaria, I really appreciate all your feedback sir🙌
Thank you, sir for this lecture.
You are most welcome Mercy🙌
Great Dr
Thank you Chief
Using fleiss w/ CC
Case: 55
Control: 163
Total : 218
Awesome 😎
Lovely videos
Glad you like them! Thank you Adedamola
Thank you sir
you are welcome sir😀
Feiz w/cc
cases 55
controls 163
total 218
thank you Sir
Wow!!! Super awesome 🤗
Thank you
You are most welcome 🙏
Great job! But so how do I go about determining a minimum sample size for match case control?
Great question Shamsudini. Epi info doesn’t have a module for matched case control. I am afraid we may have to use the formula method to calculate it.
I have a study with cases occult hepatitis B ( P: 10℅) , controls 1 , chronic HBV (P: 8,2℅), negative control ( without viral hepatitis)
How can I calculate the sample size
Dr Khadija will need a minimum of 230 fleiss w/cc I.e 58 cases and 172 control.she will a minimum of 230 sample size.Thank you so much sir,so interesting and succinct.
Awesome 👏
Dr khadija will need 218 fleiss with cc . She will need 55 cases and 163 control which gives 218 sample size if 30% of control exposed.
Thank you so much sir
You are most welcome Chief Habibu 🙌
Using the Fleiss with continuity correction formulas, we got a minimum sample size of 218 patients with minimum number of cases 55 and control of 163.
Wow! Super awesome. Uduak 🙌
Thank you Sir. please provide us with how to cal s.z of matched case control
Great question. Unfortunately Epi Info mobile doesn’t have a module for Matched Case control studies. I will cover another tool that can do that soon. Please stay tuned 😊
its a nice presentation. can we use only one research finding to get a percent of control exposure and odds ratio? how can we calculate sample size if there are different associated factors for our case in different literature? please respond to me
Great question. Yes you can use only one research to get the elements needed to calculate the sample size. And if there are different studies you can use the study that gives you the largest sample size. If there are different associated factors, calculate for all the associated factors and use the one that gives you the largest sample size. If the data is from different populations in different regions, use the one for your region or that is closest to your region. I hope this helps?
thanks a lot, I understand what you said this was my challenge since I started my proposal @@EpiInfoforRookiesE4R
230 is the minimum sample size calculated by Fleiss w/cc.
Great response Mashak, How many cases and how many controls?
Here we go
Great 👍
What makes a high statistical power?
Thanks
You are most welcome Firew🙏
Thank you very much for this awesome video, i am a public health student and I was doing my thesis proposal but am stuck can you please help me sir !
Sorry to hear. How can I help you with your proposal
@@EpiInfoforRookiesE4Rcan I do a comparative cross sectional study for two groups with different sample size?
And also my thesis is to compare effect of anesthesia method(general and spinal) on apgar score of neonates. What do u advice me? Thank you so much for replying back to my comment 😊
What if you don’t have any exposure info on cases and controls? Will you do a pilot study?
Yes, you may need to rely on a pilot study to get that information. I hope this helps?
Sir, please what are the meanings of
Desired level of confidence and power of study
make a video for cohort study sample size
Okay Sidra, coming up soon God willing 🙏, please stay tuned
please help how to do so.. i m still confused
What is the issue about? Let me know specifics so I can help you
👍👍
Gracias 🙏
With the following variables:
Study design[unmatched case control study]
Confidence level[99.9%]
Power of study[90%]
Ratio of control[3:1]
Level of exposure for Contol[120/408 exposed converted to 29.4%]
Odd ratio was given as[4.5]
Level of exposure for cases[ The odd ratio actually helps us to get it, when inputed]
Using Fleiss w/cc
Cases-55
Control-163
Total-218
the above is the minimum sample size needed for the study.
Wow!! Great stuff Favour 👍
Cases-55, Control-163, Total-218 Using fleiss w/CC
Awesome 👏
I am planning to conduct study about risk factors of recurrent stroke.I have previous study with results in percentage but epiinfo needs odds ratio. How can I calculate sample size
Great question Salu! What kind of study are you trying to conduct? If it is a case control study, you can either enter the percent of controls exposed and the Odds ratio or the percentage of cases with exposure. If you enter the percent of cases with exposure , the odds ratio will be computed immediately. I hope this helps?
I got this result using Fleiss w/cc in epi info : cases 29 and controls 87 and a total of 116 , but I couldn’t change the confident level to 90% … is that ok ?
Awesome 👏
I have one question. I noticed that epi info can’t calculate everything e.g: matched case- control or matched cohort. Does this mean that StatsDirect on a laptop is better?
Please without Epinfo mobile , can this be calculated manually?
Yes, just apply the formula that I showed in the video. Epi Info just makes it easier that’s all.
Im very interesting, if just you could translate or subtitle it some time in French, I understand at 50%. Thank you very much sir ! good video
Awesome response, I will work on the French versions. Thank you for your feedback Benjamin
After designing my e-question I was unable to publish to the web to get response
Hi Daniel, in order to publish to the web, you will need to have your own web server. Check out how to do it here www.cdc.gov/epiinfo/user-guide/survey/introduction.html. I hope this helps?
Good morning sir
Thank you for the lecture sir.
I tried downloading epiinfo app but was unable to as they said my phone is beyond loading the app
What should I do sir.please
Thank you sir
Hi Rabi, you would need to download the APK file from the internet as the play store is currently not supporting Epi Info for Android. You can check the description section of this video th-cam.com/video/Eryj1eQDPsg/w-d-xo.htmlsi=qzec24cTaiyRH680 to download the APK. I hope this helps?
Fleiss w/CC : Cases -55, control - 163 and Total -218
Great stuff👍
Sample size َe fleiss w/cc is 218
🌸🌸🌸🌸🌸🌸
Awesome
Good morning doc, please you may need to guide me. I have here cases to be 55, control= 163 and total sample size at 218. I use 30% as my percentage of controls exposed. thank you
This is super awesome Ije 👌. Which method did you use?
So from the the question, if 120 out of 400 have consumed a lot of fries, the percentage control exposed will be 120/400*100 = 30%. I wouldn't know if I am right
@@ijeomauzor4702 you are very correct ma'am. 😊👍
@@ijeomauzor4702 as per methods, i was referring to the formula that you used for your answer, whether you used the Kelsey, Fleiss or Fleiss with CC?
I used Fleiss with CC
Cases - 55
Control - 163
Total - 218
What should I use to calculate a sample size for matched case-control estudy? Can Epi Info do it?
Hi Brenda, Epi info can only be used for unmatched case control study sample size calculations. But you can use this tool here shiny.vet.unimelb.edu.au/epi/sample.size.mccs/. I will be making a video about using it soon so please stay tuned ☺️
Please do for cohort🙏
Alrighty, coming up soon, please kindly stay tuned 🙌
Coming soon sir 😊
So life can be this easy?
Yes sir. Welcome to the easy peasy revolution 😊
Hlo Sir, I have one doubt
Yes sir, I can help
If I can't find OR from the previous study?
What must I do, sir?
Great question Wahyu! If you don’t have the odds ratio from a previous study, you can use the hypothetical percentage of exposure among the cases and control. This can be based on previous studies or advise of an expert in the field that you are studying. I hope this helps?
@@EpiInfoforRookiesE4R Thank you, sir..
How can detect level of confidence and power ?
Great question Maha. These are values that are set by the researcher. If you want your results to be more accurate then you increase the level of confidence as well as the power. Naturally when you increase any of the two the sample size will increase. Typically researchers use a confidence level of 95% and a power of 80% for observational studies and 99% and 90% for experimental studies. I hope this helps?
please i want the site for the formulars
What if there is no baseline research
Great question! You will need to do a pilot study or you can use values based on the experience of a learned scientist in the field you are studying. I hope this helps?
What makes a high statistical power?