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Repetitive Behavior Scale-Revised (RBS-R): This scale is the most frequently used to measure the severity of RRBs. The 43 items were compiled into six subscales: stereotyped behavior, self-injurious behavior, restricted behavior, compulsive behavior, ritualistic behavior, and sameness behavior (Bodfish et al., 2000). RBS-R has a good psychometric criterion. Some researchers have also developed five- and three-factor models (Lam and Aman, 2007; Mirenda et al., 2010; He et al., 2019), but their applicability needs to be proven in future studies. Considering comprehensive items and convenient use, RBS-R has a wide range of clinical applications (Lam and Aman, 2007; Mirenda et al., 2010; Bishop et al., 2013; He et al., 2019).
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Aberrant Behavior Checklist (ABC): This is a caregiver rating scale used to assess behavioral problems in ASD (Aman et al., 1985; Kaat et al., 2014). Compared with other tools, ABC includes more comprehensive behavioral problems. Besides RRBs, it also investigates other aspects, such as emotional stability, attention, and hyperactivity. Currently, ABC applies to children and adults and is used for measuring the results of drugs and behavioral interventions in individuals with ASD (Owen et al., 2009; Bearss et al., 2013). Nevertheless, a potential disadvantage is that the stereotypic behavior subscale contains only seven items mainly describing stereotyped motor and limb movements.
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Repetitive Behavior Questionnaire (RBQ): The RBQ is created for the sole purpose of assessing RRBs and includes 33 items (Honey et al., 2012). Twenty-nine items examine four subtypes of RRBs, including repetitive movements, sameness behaviors, repetitive use of language, and circumscribed interests. The four additional items consist of a summary item, which examines children’s overall interests or hobbies, and three open questions: the earliest repetitive activity, the most marked or noticeable behaviors, and the problematic repetitive behaviors. Based on RBQ, some researchers have developed RBQ-2 (Leekam et al., 2007) and RBQ-2A (Barrett et al., 2015) suitable for adults and children, respectively. RBQ checks the frequency of specific RRBs. Thus, it is very suitable to study the frequency or prevalence of RRBs. Moreover, three open questions also provide more information. So far, RBQ is not widely used in clinical practice.
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