The current study evaluated a brief, informant-based autism interview: the Developmental, Dimensional and Diagnostic Interview -- Adult Version (3Di-Adult). Feasibility, reliability and validity of the Dutch 3Di-Adult was tested amongst autistic participants (n = 62) and a non-autistic comparison group (n = 30) in the Netherlands. The 3Di-Adult…

This original paper, based on data from the Erasmus+Blurred Lives Project, presents a new multi-dimensional categorisation model to describe negative online experiences, including forms of cyberbullying, based on a study of internet usage among over N = 2,500 adolescents with lower socio-economic status (SES) backgrounds across five European…

Background: Gaining insight into sleep-wake patterns of persons with intellectual disabilities is commonly done using wrist actigraphy. For some people, contactless alternatives are needed. This study compares a contactless bed sensor with wrist actigraphy to monitor sleep-wake patterns of people with moderate to profound intellectual…

This study aimed to review the validity and/or reliability of light-intensity physical activity (LPA) questionnaires and identify the most suitable questionnaires for measurement of LPA in adults. Following the PRISMA-P 2020 guidelines, we searched MEDLINE, PsycINFO, CINAHL, Scopus, Embase, and MedNar. Only studies that targeted adults [greater…

Assessment and monitoring of safety in special education schools is imperative to establish and maintain a safe environment in which students can develop academic and social-emotional skills. The present study describes the development of a student self-report measure, the Safe at School questionnaire. Factorial validity, reliability and…

Introduction: In persons with severe to moderate intellectual disability (SID), no valid and reliable diagnostic instrument is available to determine PTSD. In this study, a new instrument was evaluated: the Diagnostic Interview Trauma and Stressors -- Severe Intellectual Disability (DITS-SID). Methods: DITS-SID, Aberrant Behavior Checklist and…

Background: There are no psychometrically validated instruments available to measure motor skills of children with profound intellectual and multiple disabilities (PIMD). In this study, the construct validity and reliability (Rho) of the Motor Development List for children with PIMD (MDL-PIMD), a proxy-reported measure, was investigated. Methods:…

Adaptive teacher support (i.e., support that is tailored to students' understanding) is considered crucial for students' learning. Previous research examined support adaptivity mostly in small-scale, observational studies without distinguishing between theory-based facets of support adaptivity. Yet, students' perceptions of different aspects of…

For autism spectrum disorder (ASD) in adults there are several diagnostic instruments available with a need for consideration of the psychometric properties. This study aimed to conduct a first psychometric evaluation of a new diagnostic ASD instrument, the NIDA (Dutch Interview for Diagnostic assessment of ASD in adults) in 90 adult males without…

Academic self-efficacy (ASE) refers to a student's global belief in his/her ability to master the various academic challenges at university and is an essential antecedent of wellbeing and performance. The five-item General Academic Self-Efficacy Scale (GASE) showed promise as a short and concise measure for overall ASE. However, of its validity…

This paper presents a cross validation study of four instruments commonly used to assess educator proficiency in technology integration. Data for the validation study were contributed by 357 teacher preparation candidates enrolled in university coursework in the Netherlands. Factor analysis, multidimensional scaling, reliability analyses and…

Purpose: The three variants of primary progressive aphasia (PPA) differ in clinical presentation, underlying brain pathology, and clinical course, which stresses the need for early differentiation. However, brief cognitive tests that validly distinguish between all PPA variants are lacking. The Sydney Language Battery (SYDBAT) is a promising…

The choice of cortisol sampling times in early childhood studies varies widely. Given that recommendations on sampling protocols are largely based on adults, the present study aimed to broaden current knowledge by examining how reliably cortisol measures obtained at different daytimes would reveal between-individual differences in toddlers'…

The objective of this study was to develop and validate an instrument measuring the perception and interpretation of several distinct musical features (pitch, tonality, timing, loudness, and timbre). Therefore, we developed the Implicit Tonal Ability Test (ITAT), a listening test containing 49 multiple-choice items. A total of 233 children aged 6…

Background: Body experience is an important facet of psychosocial functioning and health. However, to date no test exists to measure body experience in adults with mild intellectual disability and borderline intellectual functioning (MID-BIF). We therefore adapted the Body Experience Questionnaire (BEQ) to this group, resulting in the BEQ-mb, and…