“…1, among the 2,658 behavioral intervention citations identified through the comprehensive search, 61 citations representing 27 intervention studies were eligible for review. We excluded three studies (Birkel et al, 1993;Flaskerud, Nyamathi, & Uman, 1997;Grella, Annon, & Anglin, 1995) for combining intervention and comparison groups in the evaluation, and four studies for not reporting sufficient data necessary for effect size calculation (Coyle, Kirby, Marin, Gomez, & Gregorich, 2004;Jemmott, Jemmott, Braverman, & Fong, 2005;Kipke, Boyer, & Hein, 1993;Lesser et al, 2005). Thus, 20 intervention studies (N = 6,173 participants) were included in this review and meta-analysis.…”