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The visual perceptual skills of children are often evaluated by health care and education practitioners. Even though the Test of Visual Perceptual Skills – Revised (TVPS-R) is one of the most frequently used instruments with school-age children, its construct validity has not been evaluated thoroughly. The purpose of the study was to evaluate the scalability/interval level measurement, unidimensionality, lack of differential item functioning (DIF), and hierarchical ordering of items of the TVPS-R and its seven subscales using the Rasch Measurement Model (RMM). The TVPS-R scores from a sample of 356 normally developing children (171 boys and 185 girls), ranging in age from 5 to 11 years, were used to complete the RMM analysis. When the seven individual TVPS-R scales were analysed, they all exhibited adequate measurement properties (scalability/interval level measurement, unidimensionality, lack of DIF, and hierarchical ordering). However, when they were collapsed together to form an overall composite scale of motor-free visual perceptual skills, the TVPS-R items failed to group together to measure a unidimensional construct. In addition, many scale items exhibited RMM misfit or DIF. The results suggest that the seven TVPS-R subscales can be used on an individual basis with clients to generate a profile of their motor-free visual perceptual skills, but that they cannot be summed together to calculate an overall summary motor-free visual perceptual score or perceptual quotient. The TVPS-R composite scale does not exhibit adequate construct validity.
The British Journal of Occupational Therapy (BJOT) is the official journal of the College of Occupational Therapists. Its purpose is to publish articles relevant to theory, practice, research, education and management in occupational therapy internationally.
BJOT publishes research articles, critical reviews, practice analyses, opinion pieces, editorials, letters to the editor, book reviews and an annual index. Please refer to the author's guide at http://www.cot.co.uk/british-journal-bjot/british-journal-occupational-therapy
Submissions can be made at http://mc.manuscriptcentral.com/bjot
The 2012 Impact Factor for The British Journal of Occupational Therapy is 1.096.