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Psychometric properties of the Neuropsychiatric Inventory for adults with intellectual disability
Author(s) -
Lundqvist LarsOlov,
Hultqvist Jenny,
Granvik Eva,
Minton Lennart,
Ahlström Gerd
Publication year - 2020
Publication title -
journal of applied research in intellectual disabilities
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.056
H-Index - 63
eISSN - 1468-3148
pISSN - 1360-2322
DOI - 10.1111/jar.12741
Subject(s) - intellectual disability , intraclass correlation , exploratory factor analysis , psychology , clinical psychology , internal consistency , reliability (semiconductor) , psychometrics , challenging behaviour , nursing homes , psychometric testing , psychiatry , medicine , nursing , power (physics) , physics , quantum mechanics
Background Problem behaviours are common among people with intellectual disabilities (ID), but psychometrically evaluated instruments for assessing such behaviours are scarce. The present study evaluated the psychometric properties of the Neuropsychiatric Inventory—Intellectual Disability (NPI‐ID). Method We assessed 108 residents with intellectual disabilities living in group‐homes using the NPI‐ID, which included the 12 symptoms of the original NPI‐Nursing Home and two supplementary symptoms: self‐injurious behaviour and impulsive risk‐taking behaviour. Results The NPI‐ID showed adequate internal consistency ( α = 0.76) and test–retest reliability (intraclass correlation coefficient = 0.88). Exploratory factor analysis revealed five factors accounting for 64.1% of the variance. Cluster analysis revealed that residents were clustered in three groups with distinctly different symptom profiles. Conclusions The psychometric properties were satisfactory, supporting the use of the NPI‐ID as a screening tool for people with intellectual disabilities. Additional research is needed to further evaluate the utility of the NPI‐ID among people with intellectual disabilities.