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International Journal of Epidemiology 2001;30:301-302
© International Epidemiological Association 2001

Theory and Methods

Commentary: Extending the boundaries of data collection by mail

Thomas V Pernegera,b and Jean-François Ettera

a Institute of Social and Preventive Medicine, University of Geneva,and
b Quality of Care Unit, Geneva University Hospitals, Geneva, Switzerland.

In this issue of the International Journal of Epidemiology, O'Connell et al. report on a population-based study estimating the prevalence of hepatitis B virus seropositivity in Ireland, in which saliva samples were collected by the respondents themselves, and mailed back to the researchers.1 Although the cost of the study is not reported, we may guess that it was cheap: respondents collected the samples for free, and sample delivery was the cost of a regular mail stamp. What is remarkable is not that this study was done, but that such mail-based studies are not done more often.

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