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Validation of the C hinese V ersion of the D ementia S creening Q uestionnaire for I ndividuals with I ntellectual D isabilities ( DSQIID ‐ CV )
Author(s) -
Li R. S. Y.,
Kwok H. W. M.,
Deb S.,
Chui E. M. C.,
Chan L. K.,
Leung D. P. K.
Publication year - 2015
Publication title -
journal of intellectual disability research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 104
eISSN - 1365-2788
pISSN - 0964-2633
DOI - 10.1111/jir.12173
Subject(s) - dementia , population , psychology , gerontology , medicine , disease , environmental health
Background An increasing number of people with intellectual disabilities ( ID ) are at risk of developing age‐related disorders such as dementia because of a dramatic increase in life expectancy in this population in the recent years. There is no validated dementia screening instrument for C hinese people with ID . The D ementia S creening Q uestionnaire for I ndividuals with I ntellectual D isabilities ( DSQIID ) was reported to be a valid, user‐friendly, easy‐to‐use observer‐rated instrument. It was developed in the UK and has good psychometric properties. Validation of a C hinese version of the DSQIID will facilitate its application among the C hinese population. Method The DSQIID was translated into the C hinese version ( DSQIID ‐ CV ). By purposive sampling, service users with ID aged 40 years or over were recruited through two large centres serving adults with ID in H ong K ong. Carers who had taken care of the participants continuously for the past 6 months were invited to complete the DSQIID ‐ CV . All participants were examined by qualified psychiatrists to determine the presence or absence of dementia. Results Two hundred people with ID whose age ranged between 40 and 73 years (mean 51 years, SD  = 7.34 years) were recruited to the study. A clinical diagnosis of dementia was established in 13 participants. An overall total score of 22 as a screening cut‐off provided the optimum levels of specificity (0.995) and sensitivity (0.923). The DSQIID ‐ CV showed good internal consistency (alpha = 0.945) for all its 53 items, and excellent test‐retest reliability (0.978, n  = 46) and inter‐rater reliability (1.000, n  = 47). Exploratory factor analysis resulted in a four‐factor solution explaining 45% of the total variance. Conclusions The DSQIID ‐ CV is shown to have robust psychometric properties. It is the first valid and reliable dementia screening instrument for C hinese adults with ID .

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