Journal article
Assessment of the psychometric properties of the Chinese Impact of Vision Impairment questionnaire in a population-based study: findings from the Singapore Chinese Eye Study
EK Fenwick, PG Ong, C Sabanayagam, G Rees, J Xie, E Holloway, CY Cheng, TY Wong, B Lim, PC Tan, EL Lamoureux
Quality of Life Research | Published : 2016
Abstract
Purpose: We investigated whether the Chinese impact of vision impairment (IVI) questionnaire is valid to generate reliable person estimates in a population-based sample. Methods: VRQoL was measured using the 32-item Chinese version of the IVI questionnaire in the Singapore Chinese Eye Study (2009–2011), a population-based study of the prevalence and risk factors for VI and eye diseases in Chinese Singaporeans. Rasch analysis was used to assess the Chinese IVI’s response category functioning, precision, unidimensionality, targeting and differential item functioning. The ability of the Chinese IVI to discriminate participants along the spectrum of VI demonstrated criterion validity. Results: O..
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Awarded by National Health and Medical Research Council
Funding Acknowledgements
This study was supported by grants from the National Medical Research Council (STaR/0003/2008), the Singapore Bio Imaging Consortium (C-011/2006) and the Biomedical Research Council (08/1/35/19/550). Dr. Eva Fenwick is funded by a National Health and Medical Research Council (NHMRC) Early Career Fellowship (#1072987), and Dr. Gwyn Rees is funded by an NHMRC Career Development Fellowship (#1061801). The Centre for Eye Research Australia receives Operational Infrastructure Support from the Victorian Government. The authors would like to thank Dr. Mike Linacre for his advice on conducting Rasch analysis in population-based studies.