In addition, we considered whether the primary results held up when controlling for participation in the family-based intervention, the Strengthening Families Program (SFP), in which 22.63% of those in the intervention communities took part. First, there was no difference on Peer Substance Use between SFP participants and either all others, t (1415) = 1.55, ns, or intervention community members whose families did not take part in the SFP intervention, t (727) = 0.67, ns. Second, adding a dummy variable indicating SFP participation to the analyses did not change results. Specifically, compared to -0.22 (p < .05) the three-way interaction parameter was -0.22(p < .05).
