89 The feasibility of daily monitoring 4 3.4 Standardized diary items Table 2 presents the MSSD scores that were computed per standardized diary item and per participant, on a subset of 30 participants who had >75% compliance. MSSD scores were calculated to assess the extent to which these items captured fluctuations across time. Participants differed in their average MSSD across the different diary items (range 0.02–2.14). The highest within-item MSSD scores were observed across participants in the items ‘Did you feel unrest today?’ (Mmssd = 1.19) and ‘Did you feel happy today?’ (Mmssd = 1.28). The latter item was the only item with non-zero MSSD scores for all participants. The seven other items each had MSSD scores of zero for one or more of the participants. The item that captured the least variance was ‘Did you do things purely for kicks?’ (Mmssd = 0.31) resulting in a MSSD of zero for 12 participants (40%; Table 2). 3.5 Personalized diary items The content of the personalized items illustrates what topics were relevant to the participants. The number of personalized items that were added to the standardized items varied per participant, resulting in a median total of five personalized diary items (range 0–13). Only two participants did not add any personalized items. As the content of the personalized diary items were typically related to personal goals that participants had set for themselves in treatment, the array of the diary items was highly diverse. The most frequently added items were open-ended entries asking the participant to describe their day (n =16) or highlight what was positive about their day (n =23). Furthermore, items concerning cannabis use (n = 15), alcohol use (n= 6), self-injury (n = 7), or eating behavior (n = 5) were relatively frequently added. Other items related to, for example, feeling aggressive, angry, annoyed, aroused, depressed, energetic, panicky, safe, self-confident, suicidal, tensed, quality of sleep, quality of communication with others, peer pressure, ruminations, money spending, social media use, the urge to run away, or a generic description of mood. Notably, personalized items were formulated by the participant in their own vocabulary. This meant that some items, for example ‘Did your bucket empty by smoking weed?’, may confuse outsiders, but matched the participant's self-perception and vocabulary. 4. Discussion The current study explored the feasibility of a 60-day daily diary protocol in adolescents and young adults with a mild intellectual disability or borderline intellectual functioning. An average compliance rate of 70.4% and a drop-out rate of 26% indicate that daily monitoring holds as a feasible method for data collection
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