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1 General aspects (0)   1.1 Epidemiology (10)   1.2 Population genetics (1)   1.3 Pathogenesis (9)   1.4 Quality of life (20)   1.5 Glaucomas as cause of blindness (11)   1.6 Prevention and screening (14) 2 Anatomical structures in glaucoma (0)   2.1 Conjunctiva (8)   2.2 Cornea (39)   2.3 Sclera (17)   2.4 Anterior chamber angle (13)   2.5 Meshwork (0)     2.5.1 Trabecular meshwork (16)     2.5.2 Schlemms canal (13)     2.5.3 Scleral outlet channels (2)   2.6 Aqueous humor dynamics (0)     2.6.1 Production (1)     2.6.2 Outflow (1)       2.6.2.1 Trabecular meshwork (7)       2.6.2.2 Uveoscleral (1)     2.6.3 Compostion (7)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (8)   2.9 Ciliary body (2)   2.10 Lens (2)   2.11 Vitreous body (1)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (9)   2.13 Retina and retinal nerve fibre layer (69)   2.14 Optic disc (37)   2.15 Optic nerve (3)   2.16 Chiasma and retrochiasmal central nervous system (14)   2.17 Stem cells (8)   2.20 Other (0) 3 Laboratory methods (0)   3.1 Microscopy (1)   3.2 Electron microscopy (2)   3.3 Immunohistochemistry (2)   3.4 Molecular genetics (0)     3.4.1 Linkage studies (1)     3.4.2 Gene studies (60)   3.5 Molecular biology incl. 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pharmacoeconomics (10) 15 Miscellaneous (25)

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Abstract #58734 Published in IGR 16-3

Validating the sumi quality of life questionnaire with rasch analysis

Hirasawa H; Murata H; Mayama C; Asaoka R
Investigative Ophthalmology and Visual Science 2014; 55: 5776-5782

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PURPOSE: To validate the Sumi Visual Disability Questionnaire (Sumi VDQ) to estimate visual disability in glaucoma patients using Rasch analysis. METHODS: A total of 162 glaucoma patients underwent visual field (VF) testing in both eyes (Humphrey 24-2 Swedish Interactive Threshold Algorithm [SITA] standard program). The binocular VF was then calculated using the integrated VF (IVF) method. Visual disability was scored using the Sumi VDQ, which was originally written in Japanese and contains 30 items (questions). Response scale analysis, targeting, and infit statistics associated with Rasch analysis were evaluated. Unidimensionality was analyzed using principal component analysis (PCA). In addition, the correlation between the person parameter obtained with Rasch analysis and the mean of total deviation values (mTD) in the IVF was compared with the correlation between the arithmetic sum of visual disability score and mTD of the IVF. RESULTS: All 30 items in the Sumi VDQ showed productive infit values (0.61-1.46). The person parameters distributed between -4.50 and 3.62, while the item difficulty targeting parameters distributed between -0.88 and 2.06. None of the PCA components had eigenvalues whose lower limit of 95% confidence interval (CI) exceeded 2 (0-1.5). There was a significant relationship between person parameter and mTD of IVF (r = -0.78, P < 0.001), which was significantly stronger (Meng-Rosenthal-Rubin method, P = 0.002) than that between arithmetic sum of visual disability score and mTD of IVF (r = -0.61, P < 0.001). CONCLUSIONS: The Sumi VDQ has constructive psychometric properties. In particular, the Rasch analysis-derived person parameter appears to be clinically more meaningful than the arithmetic sum of visual disability score.

Department of Ophthalmology, University of Tokyo Graduate School of Medicine, Tokyo, Japan.

Full article

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Classification:

1.4 Quality of life (Part of: 1 General aspects)

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