Table 3.

Reasons for ineligibility for analyses as a function of study condition.

	Affirmation n	Control n	Total n
Total number of users that were not eligible	856	942	1798
Under 18	0	13	13
Did not set a valid quit date (ie, did not set a quit date or set date for 3014)	37	62	99
Did not set a quit date at least one day after the day of enrollment and thus may have already tried to quit before receiving any affirmationsa	613	669	1282
Did not remain enrolled in the study through selected quit date	172	183	355
Set quit date too far into the future	53	50	103

Note: Some users were ineligible for more than one reason

^aSelf-affirmation has been shown to be ineffective when introduced after defensive responses to a threat [19]; thus, individuals who did not have the opportunity to affirm prior to or at the time of trying to quit were ineligible.