Table 4.

Table of detailed measures of program exposure

Email prompts	a) Percentage of participants receiving email prompts	Programmatic rules defined the timing of email prompts regarding completion of online assessments that were sent to participants in both conditions. Participants in the Enhanced condition also were sent "treatment-related" email prompts that contained tailored content related to quitting plan, quit date, and support of continued abstinence.
Participant visits	b) Number of visits	Visits by each participant to access smokeless tobacco cessation content on their assigned website were counted. All visits in which only online assessments were accessed were excluded.
	c) Aggregate duration of visits	Duration of each visit was defined as the sum of Web page durations during that visit. With one exception (noted next), Web page durations were defined as their logged end time minus start time. Because our program logic did not include a session-expiration feature that automatically logged out after a period of inactivity, we conservatively approximated the end of the visit by using the date/time of the last Web page that had been accessed before the abrupt end of the session. In addition, we followed the operational definition for visit expiration recommended by Peterson; that is, any Web page viewed for 30 minutes or more was defined as having ended the visit using the ending date/time stamp of the Web page that immediately preceded the hiatus. Moreover, if, after the hiatus, the participant resumed activity, it was considered to be a new visit for measurement purposes.
	d) Number of daily visits post-enrollment	The number of daily visits per participant was counted with "days" being defined in terms of their occurrence relative to the participant enrollment date. Participants could have more than one visit per day, and visits were defined using Peterson's recommendation (see above). Total visits per post-enrollment date aggregated these data across participants.
	e) Number of days of program access post-enrollment	The number of days of post-enrollment access to smokeless tobacco cessation content was defined for each participant as the last visit date minus the enrollment date.
	f) Plan to Quit	Participants in the Enhanced condition were given the opportunity to define a personal quitting plan and quit date. Although the program allowed participants to define their quitting plan and date multiple times, for purposes of the analyses in this report, we focused only on the first recorded date when a participant defined his/her quitting plan/date.
	g) Smokeless tobacco quit status	Participants in the Enhanced condition were able to indicate that they had quit using smokeless tobacco. This report enabled them to access "Staying Quit" content.
Web page views	h) Overall number of Web page views	The total number of Web pages viewed was logged.
	i) Specific page views (selected smokeless tobacco cessation content)	The total number of selected Web pages viewed related to smokeless tobacco cessation was logged, and a subset of these is described in this report.
	j) Web forum postings	Individual forum postings—in each of the two forums—were logged for each participant (Enhanced condition only).