Collecting saliva samples by mail can serve numerous purposes in epidemiologic research.
The objectives of this study were to assess what proportion of participants in a mail survey would provide a saliva sample and whether incentives could improve participation.
In 1995,2,994 students, faculty, and staff members of Geneva University, Geneva, Switzerland, were randomized to receive, together with a mailed questionnaire about smoking, a saliva vial, a ballpoint pen, the offer of a lottery, or any combination of these.
After one mailing and a reminder letter, response rates were 52% among those who had been requested to provide saliva and 63% among controls (p<0.001).
In the former group, most respondents (98%) provided a saliva sample.
Incentives improved participation only among those who were asked to provide saliva (lottery : 11% response, p=0.003 ; pen : 6% response, p=0.1).
The final participation, after up to three reminders, was 76% overall.
The authors conclude that while the collection of saliva samples by mail is feasible it tends to decrease response rates.
Mots-clés Pascal : Tabagisme, Salive, Collecte, Taux, Réponse, Epidémiologie, Participation, Méthodologie, Biais méthodologique, Homme, Questionnaire, Randomisation, Suisse, Europe, Voie postale, Biais selection
Mots-clés Pascal anglais : Tobacco smoking, Saliva, Gathering, Rate, Response, Epidemiology, Participation, Methodology, Methodological bias, Human, Questionnaire, Randomization, Switzerland, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0129483
Code Inist : 002B30A01A1. Création : 22/06/1998.