Crystal Smit

Evaluation of the Motivation Process 5 107 Motivating Influence Agents to Drink More Water Themselves To evaluate whether the training motivated the influence agents, we assessed their intrinsic motivation and their water and SSB consumption. The influence agents’ intrinsic motivation to drink water was measured at T1 and T2, using three items (see Table 5.1) adapted from a scale based on exercising (Markland & Tobin, 2004; Smit et al., 2018), with a 6-point response scale ranging from 1 = ‘no, certainly not’ to 6 = ‘yes, certainly’. A total score for intrinsic motivation was constructed by averaging the three items. To assess water consumption at T1 and T2, the influence agents indicated on three different days (i.e., every other day during each assessment) on an 8-point scale ranging from 0 = ‘zero glasses per day’ to 7 = ‘seven or more glasses per day’ how much water they had drunk the day before. A total score for water consumption was constructed by averaging the influence agents’ reported consumption over the three days. To assess the influence agents’ SSB consumption they had to indicate on three different days (i.e., every other day during each assessment) how much sweetened fruit juice, lemonade (based on sugar syrup), soda, energy, and sports drinks they had drunk the day before (Bevelander et al., 2018; Smit et al., 2016). The same response scale as with water consumption was used. To assist them in recognizing each of these types of beverages, examples of frequently consumed beverages were included for each item. A total score for SSB consumption was constructed by averaging the influence agents’ reported consumption on these five items over the three days. The influence agents also provided responses to several open-ended questions concerning their experiences with the training, which were used to evaluate the self-determination theory-based techniques that were implemented to motivate them. Supporting Influence Agents inMotivating Their Peers to DrinkWater To evaluate whether the training supported the influence agents in optimally motivating their peers, we assessed their peers’ intrinsic motivation, perceived social support, and social norms regarding water drinking. The intrinsic motivation of the peers was measured at T1 and T2 with the same three items (see Table