| Titre : | Collecting saliva samples by mail. (1998) |
| Auteurs : | J.F. ETTER ; T.V. PERNEGER ; A. RONCHI ; Institute of Social and Preventive Medicine. University of Geneva. Geneva. CHE |
| Type de document : | Article |
| Dans : | American journal of epidemiology (vol. 147, n° 2, 1998) |
| Pagination : | 141-146 |
| Langues: | Anglais |
| Mots-clés : | Tabagisme ; Taux ; Epidémiologie ; Participation ; Méthodologie ; Biais ; Homme ; Questionnaire ; Suisse ; Europe ; Biais sélection |
| Résumé : | [BDSP. Notice produite par INIST 8EYpcR0x. Diffusion soumise à autorisation]. 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. |
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