78 Chapter 4 be subject to day-to-day fluctuations, reflecting ‘the issue of the day’ rather than phenomena that fluctuate month-by-month or annually. Daily diary items thus ideally yield temporal answer patterns with day-by-day fluctuations. That way, daily diaries can contribute more to treatment than traditional self-report assessments like (e.g., trimonthly) routine outcome monitoring surveys. 1.4 Current study The current study will explore the feasibility of a 60-day daily diary EMA protocol, with both standardized and personalized items, for adolescents and young adults with a mild intellectual disability or borderline intellectual functioning who receive care in either an outpatient, residential or juvenile detention setting. More specifically, we addressed four research questions. First, how high are compliance and drop-out rates? Second, which demographic and contextual factors associate with compliance? Third, how acceptable do participants perceive the daily diary protocol? Fourth, which diary items bear personal relevance and are sensitive to day-to-day fluctuations? The latter is explored by presenting the content of the personalized diary items and analyzing the extent to which each of the standardized items captured day-to-day fluctuations. This study aims to inform clinical research and practice for adolescents and young adults with a mild intellectual disability about the feasibility of daily diary monitoring. Due to the exploratory nature of this study, we posed no specific hypotheses for the research questions. 2. Methods 2.1 Design The current research was an observational study that included an intake, a 60-day diary period and a structured follow-up interview. The study was approved by the Ethical Committee Social Sciences of Radboud University (ECSW-2020-105). The pre-registration and justifications for later amendments to the design can be found via https://doi.org/10.17605/OSF.IO/DPBK8. 2.2 Participants Recruitment took place by distributing information folders to care professionals1 at Dutch care facilities specialized in treating complex behavioral problems in young people with a mild intellectual disability or borderline intellectual functioning. It should be noted that in the Netherlands, those with a mild intellectual disability (IQ 50–70) and those with borderline intellectual functioning (IQ 71–85) have access to the same specialized care facilities. Participants who were interested, were
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