80 Chapter 4 done because some participants indicated that they wanted to complete their daily diary right before sleeping, which for some occasionally was way past midnight. A reminder was automatically prompted if the survey had not been completed one hour after the initial survey prompt. Figure 1 Screenshot of daily diary showing the standardized item “Did you feel happy today?” Note. The Dutch question and rating scale translate to “Did you feel happy today?” with response option “Moderate” selected on a rating scale between “Not at all” and “Very much”. The daily diary survey included eight items that were the same for all participants, which were aimed at assessing both internalizing symptoms (anxiety sensitivity, negative thinking) and externalizing symptoms (impulsivity, sensation seeking). The items inquired to what extend the person was (1) feeling happy, (2) worrying about the future, (3) feeling fearful, (4) feeling nervous, doing things (5) that you regret, (6) without thinking, (7) for kicks, and (8) feeling unrest, on that particular day. These eight items could be answered on a slider with five answer options that ranged between ‘not at all’ and ‘very strongly’. Figure 1 visualizes what this looked like in
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