Crystal Smit

Social Network Intervention 2 39 and marginal significant main effects for condition and time ( p = .086 and p = .092, respectively). The univariate outcomes of the multivariate model showed weaker but comparable findings. Significant and marginal significant interaction effects were found between condition and time on water drinking ( F (1,181) = 3.64, p = .058, p η 2 = .02), SSB consumption ( F (1,181) = 5.56, p =.019, p η 2 = .03) and water drinking intentions ( F (1,181) = 2.81, p = .095, p η 2 = .02). For water drinking, posthoc analyses showed that children in the intervention condition reported a marginally significant increase in their water consumption over time ( M baseline = 2.68 ± SEM .15; M post-intervention = 2.90 ± SEM .16; p = .080), which was not the case for children in the control condition ( p = .376). For SSB consumption, the children who were exposed to the social network-based intervention reported a significant decrease in their SSB consumption over time ( M baseline = 1.34 ± SEM .08; M post-intervention = 1.11 ± SEM .07; p < .001), but not in the control condition ( p = .610). For water drinking intentions, the children in the control condition reported a significant decrease over time ( M baseline = 2.76 ± SEM .07; M post-intervention = 2.60 ± SEM .07; p = .025). This was not found for the children in the intervention condition ( p = .814). A paired sample t -test was performed to explore the effect of the intervention on the water drinking behaviors and intentions of the influence agents ( n = 25). The influence agents reported a marginal significant increase in their water consumption ( M baseline = 2.64 ± SEM .28; M post-intervention = 3.00 ± SEM .27; p =.056) and a marginally significant decrease in their SSB consumption over time ( M baseline = 1.10 ± SEM .13; M post-intervention = .88 ± SEM .10; p = .071). The influence agents did not report a significant change in their water drinking intentions over time ( p = .540). DISCUSSION The Share H 2 O intervention aimed to promote water consumption among primary schoolchildren by exposing children to influence agents from their own classroom. In the present pilot study, we tested the effectiveness of this intervention by examining its impact on children’s self-reported water drinking behaviors. Consistent with our expectations, the intervention with influence agents encouraging their peers to consume more water resulted in children reporting an