Chapter 6 156 20-item PANAS [52]. Previous research showed that the I-PANAS-SF had acceptable psychometric properties [50]. Similarly, the Dutch version of the PANAS showed sufficient validity and reliability [51]. In the current study, the internal consistency of the positive affect scale was α = .77 at T0 (n=80), α = .68 at T1 (n=26), and α = .62 at T2 (n=15). For the negative affect scale, the internal consistency was α = .63 at T0 (n=80), α = .69 at T1 (n=26), and α = .82 at T2 (n=15). Emotion regulation difficulties Emotion regulation difficulties were measured using the Difficulties in Emotion Regulation Scale Short Form (DERS-SF) [52]. This scale contains 18 items and measures emotion regulation difficulties (i.e., emotion dysregulation) across six dimensions: nonacceptance, goals, clarity, awareness, impulse, and strategies. Items were rated on a five-point Likert scale ranging from 1 “almost never” to 5 “almost always”. The DERSSF showed excellent psychometric properties in its original validation. Cronbach’s alpha coefficients for all six DERS-SF subscales ranged from .79 to .91 [53]. In the current study, the internal consistency of the three subscales used for screening were: α = .78 at T0 (n=80), α = .79 at T1 (n=26) and α = .80 at T2 (n=15) for the awareness subscale; α = .83 at T0 (n=80), α = .49 at T1 (n=26) and α = .89 at T2 (n=15) for the impulse subscale, and; α = .71 at T0 (n=80), α = .74 at T1 (n=26) and α = .75 at T2 (n=15) for the strategies subscale. Qualitative data At post-intervention (T2) the participants were asked five open-ended questions about their experiences with the exercise performed. “Which aspects of the exercises did you find useful?”, “Which aspects of the exercise did you not find useful?”, “Which (new) insights or skills did you acquire by practicing with the exercise?”, “How would you adapt the exercise so it would be able to help you better?” and “Is there anything else you would like to share with us?”. Procedure Ethics This study was approved by the BMS Ethics Committee of the University of Twente (file number: 200091). Study procedure An overview of the study procedure is presented in Table 2. Before participation, participants were informed about the research aim and asked if they wanted to take part in the current study. Participants were enrolled on a voluntary basis and after reading the information sheet and consenting to participate. Then, participants filled out
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