Questionnaires were distributed by post, with requests to complete and return them in postage-paid envelopes.
Questionnaires were distributed by post, accompanied by second distinguishable copies for household partners in cases where they were not themselves affected by headache; these would be a control group for future analysis.
Questionnaires and supporting documents were distributed by post to each of these, in a parcel that also contained information about the study and its objective, the informed-consent form to be signed, instructions on how to complete the questionnaire and a prepaid envelope addressed to ASL for returning the documents.
The information sheets and study questionnaires were distributed by post.
1065 Pediatric Sleep Questionnaire (PSQ) packets were distributed by post to randomly selected parents of second grade students; 763 (72%) were returned.
Age was dichotomized at 45. Questionnaires, covering letters ensuring confidentiality, and numbered and pre-stamped envelopes for the answers were distributed by post.
A public health questionnaire in Thai was distributed by post to the entire population of Thai women, aged 18 64, residing in two regions in Sweden since 2006.
It was piloted on primary dental care practitioners, modified in light of feedback and re-tested on another sample of practitioners to improve the phrasing of questions, before being distributed by post.
1065 Pediatric Sleep Questionnaire (PSQ) packets were distributed by post to randomly selected parents of second grade students; 703 (66%) subjects were included in the study group; each parent/guardian participant had one second grade child.
The questionnaire was modified following a small pilot study, leading to changes in the format of the questionnaire and minor alterations in the wording of questions, before being distributed by post to the research population.
