PMC1550633_01
Invitation email written in hypertext markup language used in Study 1
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figure1
In the first group, emails indicated that the first 30 respondents would receive a Can $20 electronic gift certificate for use at an online bookstore if they went to the Smoking Zine website and responded to a short online survey (Figure 1). In both groups, the invitation email was written in hypertext markup language (HTML) and contained images including a prominent banner depicting a Can $20 gift certificate, a logo of the University of Toronto, and screen images of the front page of the Smoking Zine and the CyberIsle websites (Figure 1).
Reminder email written in plain text used in Study 1
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figure2
The reminder email messages were fully text-based (not HTML-based) and no graphical images were used (Figure 2).