I want to conduct a study on the prevalence of something in a strata of faculty teaching online. l sent out survey using Google form and can only do online due to travel restrictions. I wonder if 50 samples are enough
Dear Mr. Miranda!
You raised an important issue. I searched for YOU studies (cases) that might be of help:
1) Banik, R., Rahman, M., Sikder, M.T. et al. Knowledge, attitudes, and practices related to the COVID-19 pandemic among Bangladeshi youth: a web-based cross-sectional analysis. J Public Health (Berl.) (2021). https://doi.org/10.1007/s10389-020-01432-7 Free access: Article Knowledge, attitudes, and practices related to the COVID-19 ...
2) Wang, S., Zhang, Y., Guan, Y. et al. A nationwide evaluation of the prevalence of and risk factors associated with anxiety, depression and insomnia symptoms during the return-to-work period of coronavirus disease 2019 in China. Soc Psychiatry Psychiatr Epidemiol (2021). https://doi.org/10.1007/s00127-021-02046-4 Free access: Article A nationwide evaluation of the prevalence of and risk factor...
3) Ladiwala, Z.F.R., Dhillon, R.A., Zahid, I. et al. Knowledge, attitude and perception of Pakistanis towards COVID-19; a large cross-sectional survey. BMC Public Health 21, 21 (2021). https://doi.org/10.1186/s12889-020-10083-y Free access: Article Knowledge, attitude and perception of Pakistanis towards COV...
4) Oyeyemi, O.T., Oladoyin, V.O., Okunlola, O.A. et al. COVID-19 pandemic: an online-based survey of knowledge, perception, and adherence to preventive measures among educated Nigerian adults. J Public Health (Berl.) (2021). https://doi.org/10.1007/s10389-020-01455-0 Free access: Article COVID-19 pandemic: an online-based survey of knowledge, perc...
5) Neill, R.D., Blair, C., Best, P. et al. Media consumption and mental health during COVID-19 lockdown: a UK cross-sectional study across England, Wales, Scotland and Northern Ireland. J Public Health (Berl.) (2021). https://doi.org/10.1007/s10389-021-01506-0 Open access: Article Media consumption and mental health during COVID-19 lockdown...
Yours sincerely, Bulcsu Szekely
There is no arbitrary sample for a specific study. For a well designed study, if have to follow standard sample size calculation. For a cross-sectional study you can follow sample size calculation using pilot data or previous literature data with same objective. You can follow this free software to calculate this,
http://www.openepi.com/SampleSize/SSMean.htm
For a prevalence study sample size becomes an important factor. Standard method of calculating sample size should be used.
Ronan Conroy has published a guide on this which included prevalence studies among others
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