244 Chapter 5 RESULTS General Manipulation, Trailer Manipulation and Randomisation Check Participants who were aware of the study aims (n = 0) and/or knew MindLight prior to the experiment (n = 1) were excluded from the analyses. The two trailers induced expectations as intended with our manipulation (see Table 3 and the pilot study in the preregistration; Wols et al., 2019). Descriptive statistics for the entire sample and for each experimental condition are provided in Table 1. Randomisation was successful indicating no differences between the experimental conditions on any study variables. Table 3 Trailer Manipulation Check Experimental condition Mental health trailer Entertainment trailer Expectations reported 62.1% mentioned mental health benefits of the game and/or that the game was a mental health game. 82.1% mentioned the entertainment value of the game and/or was positive about the game. 14.3% was negative about the game. For 1 participant it remained unclear whether (s)he was positive or negative about the game. Trailer message awareness 93.1% noticed that the message in the trailer was focused on how MindLight could help people who feel stressed/ anxious or have some mental health difficulties. 6.9% did not notice this. 50% noticed that the message in the trailer was focused on game enjoyment. 42.9% did not notice this. For 2 participants their answers were missing. Experienced Fun and Change in Affect Experienced fun did not significantly differ between the two trailer-conditions. The interactions between trailer-condition and motivation to change or anxiety symptoms did not have a significant effect on experienced fun (see Table 4). For positive affect, we found a significant decrease from pre- to post-test (t(56) = 5.87, p = .001; 95%CI mean difference [0.50;0.99]). Furthermore, affect at post-test did not significantly differ between the two trailer-conditions. The interactions between trailer-condition and motivation to change or anxiety symptoms did not have a significant effect on affect at post-test (see Table 4).
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