A set of training materials for professionals working in intervention epidemiology, public health microbiology and infection control and hospital hygiene.
Need help with your investigation or report writing? Ask the Expert. Free advice from the professional community.
You can't make decissions on this page's approval status because you have not the owner or an admin on this page's Group.
Jean Claude Desenclos
A well designed questionnaire has a good appearance, is short and simple and covers topics relevant to the study question. It has a logical structure and a nice layout. Well designed questionnaires can attain a high response rate and allow for an easy data summarisation and analysis. The Seven Golden Rules are helpful to design appropriate questions.
Questionnaire should always be accompanied by a cover letter (if administrated by mail) or an introduction by the interviewer. The introduction should include information on:
Confidentiality should be guaranteed. The time requested to fill in the questionnaire or the length of interview should be indicated correctly. Most importantly, the introduction should clarify the usefulness of the study to the potential respondents and convince them to participate.
The first page of a questionnaire should include the return address and the study title in bold. All pages should bear an identifying mark or a unique identifier, page numbers and directions for interviewers or interviewees. The items should be numbered. If you are choosing to send a questionnaire by mail, the sending should always include a self-addressed and prepaid envelope to facilitate a response.
Be aware that the order of the questions asked might influence the answers. It is recommended to group the questions by topic. The starting questions should be simple, relevant to main subject and non-threatening in order to put the participants at ease and catch their interest. Although frequently done, neither demographic nor personal questions are a good start for the interview or a written questionnaire. The first questions should serve to get the participants "in the mood" for the topic of interest.
The biggest challenge in designing a questionnaire lies in keeping the focus on the research question. Sidetracking should be avoided at all costs. Avoid collecting unnecessary information that does not help answering your research question. However, demographic information should be collected.
Conclude the questionnaire by thanking the respondents for their participation and ensuring them that their participation was really helpful. At this stage participants should have the opportunity to ask questions on the study or the subject they were interviewed on. If needed, ask for permission to make further enquiries and record the telephone numbers of those who consented to do so.
Join the discussion about this article in the forum!
ecdc posted on 10/17/2012 3:43:34 PM:
OJE published "Case-control studies: basic concepts"
Abs: The purpose of this article is to present in elementary mathematical and statistical terms a simple way to quickly and effectively teach and understand case-control studies, as they are commonly done in dynamic populations-without using the rare disease assumption. Our focus is on case-control studies of disease incidence (‘incident case-control studies'); we will not consider the situation of case-control studies of prevalent disease, which are published much less frequently.
Ref: Jan P Vandenbroucke and Neil Pearce: Case-control studies: basic concepts Int. J. Epidemiol. (2012) 41(5): 1480-1489 doi:10.1093/ije/dys147 http://ije.oxfordjournals.org/content/41/5/1480.full.pdf+html
Arnold Bosman replied on 10/21/2012 1:22:41 PM:
Good reading !
The need to use case control in prevalent diseases occurs often. In that case we need to understand that 'the rare disease assumption' does not really exist, yet we need to think carefully about where we select our controls. The core principle is that we select controls because we want to measure 'how the exposure of interest is distributed in the population that gave rise to the cases.
On this topic, a very readable article appeared in Eurosurveillance. Olivier le Polain de Waroux and his co-authors do a great job describing and explaining the principles of case-cohort, with very useful examples.
I can invite everyone to read this piece:
Le Polain de Waroux O, Maguire H, Moren A. The case-cohort design in outbreak investigations. Euro Surveill. 2012;17(25):pii=20202. Available online: http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20202
sbpmebxu replied on 7/29/2015 7:35:38 PM: 1
sbpmebxu replied on 7/29/2015 8:10:37 PM: 1
You need to be logged in to post comments.
You can log in here. You can register here if you haven't done so yet.