i need to find out the sample size as no research has been done on this topic so no stats are available and how can i tailor the research for use in hospital setting ???
This question has been asked often here. I suggest you search the questions section and also google this question. There are many things to consider. Best wishes, David Booth
Please read the paper attached herewith - it should help you to understand a number of practical issues that need to be taken into consideration when calculating a sample size for prevalence.