106 Chapter 5 ranging between (0) “not at all” and (4) “very strongly”. The exact wording of the eight items was finetuned to the target group based on input from four youngsters with a mild intellectual disability who piloted the items. Throughout the 60-day diary period, self-ratings of participants on these items were channeled back to their care professionals, to be used as feedback for the treatments they received. The fact that care professional and participant discussed their answers in clinical settings speaks to the validity of the responses given. 2.3 Participants The current study was part of a larger feasibility study for a personality-targeted substance use prevention program for adolescents and young adults with a mild intellectual disability or borderline intellectual functioning (Hulsmans et al., 2023). In total, 50 participants – which were both substance users and non-users – enrolled in this daily diary study. From these 50, we excluded 20 participants who completed less than 75 % of their diaries (a criterion consistent with Beck & Jackson, 2020). Non-zero variance on each person’s variables is essential for idiographic networks. Because the items “Did you feel fearful?” and “Did you do things purely for kicks?” demonstrated zero variance over time for respectively 20 % and 40 % of the 30 participants, these were excluded from analyses. There were four participants who were then excluded due to zero variance on one of the remaining six items, resulting in a final sample of 26 participants that were analyzed. 2.4 Analyses All analyses were performed in RStudio-2022.02.2-458 (RStudio Team, 2022), which runs on R software (version 4.2.0; R Core Team, 2020). The dataset is available upon request from https://doi.org/10.17026/dans-z92-yv4x and R scripts are publicly available via https://doi.org/10.17605/OSF.IO/TFBPS. There were five distinct aspects to this study’s analytic strategy that are described below. 2.4.1 Attributing personality profiles Per participant, we computed a z-score for each of the four SURPS dimensions (i.e., negative thinking, anxiety sensitivity, impulsivity, and sensation seeking). The normative M and SD that were used to calculate z-scores were derived from SUPRS data of 275 other individuals with a mild intellectual disability (obtained from Pieterse et al., 2020; Poelen et al., 2017; Schijven et al., 2020a). A participant’s personality profile was then determined based on the highest z-score (cf. O'LearyBarrett et al., 2016).
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