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Participants were randomly assigned to one of the three treatment groups (TFS, TFSB, or UCC) and given an identification number to ensure anonymity.
Three hypotheses were investigated: (1) pregnant adolescent smokers who participate in a smoking cessation intervention will significantly increase their knowledge of the detrimental effects of smoking on pregnant women and their fetuses; (2) pregnant adolescent smokers who quit smoking after participating in a smoking cessation intervention will show significantly greater increases in knowledge of the detrimental effects of smoking on pregnant women and their fetuses than will those who do not quit; and (3) pregnant adolescent smokers in the TFS and TFSB intervention groups will show significantly greater increases in knowledge of the detrimental effects of smoking on pregnant women and their fetuses than will those in the UCC group.
For the entire sample (UCC, TFS, and TFSB groups), the increase in mean SHEQ (knowledge) score from [T.sub.1] (M = 5.72) to [T.sub.2] (M = 6.76) was highly significant (t = 3.945, df = 70, p = .000).
Together, the adolescents in the TFS and TFSB intervention groups had significantly greater increases in SHEQ scores from [T.sub.1] to [T.sub.2] (F = 5.789, df = 66, p = .005) and significantly higher SHEQ scores at [T.sub.2] (F = 4.365, df = 66, p = .017) than did the adolescents in the UCC group.
In the TFSB group, there was a trend for adolescents who quit to demonstrate greater increases in knowledge compared with those who did not quit (F = 2.198, df = 17, p = .158).
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