College of Nursing and Health Sciences at Flinders University are pleased to present the inaugural HDR Student conference. This is an annual event to provide HDR students an opportunity to present their research work, network with students and academic staff, meet their milestone expectations of oral presentations, and participate in professional development activities.
Browsing HDR Student conference (College of Nursing and Health Sciences) by Subject "Amblyopia"
Aim: To evaluate the psychometric properties of a novel driving scale for adults experiencing amblyopia and/or strabismus using Rasch measurement theory. Background: To develop item banks that measure quality of life dimensions, important to adults with amblyopia and/or strabismus, an extensive qualitative study was conducted in Australia and India. Among other findings, the study identified several impacts in driving, which were articulated into country-specific surveys by item refinement and revision processes. This abstract presents the psychometric validation of this scale for the Indian population. Methods: The 18-item driving scale was administered to adults in India, aged over 18 years. Rasch analysis (using Winsteps version 3.92.1) was used to assess the psychometric properties of the scale: functioning of response categories, measurement precision (PSI), fit statistics, dimensionality, targeting and differential item functioning (DIF). Results: Two hundred and thirty two participants (male: 72%, median age: 24 year; range: 18-48 years) completed the survey. The scale had a PSI of 2.44. Two misfit items were fixed by iteratively muting erroneous person responses to each item. Variance explained by the measure was 64%. The eigen value was 2.98 and 5 items loaded over 0.40; however the disattenuated correlations between the item clusters was >0.80, indicating that the items are measuring the same thing. This was further verified by splitting the scale into two and correlating person measures (spearman correlation = 0.78; 61% of the variance was shared by the measures). The final scale had ordered thresholds, PSI, 2.52 and targeting, 2.51 logits. Two items showed notable DIF based on ocular diagnosis. Conclusion: The 18-item driving scale displays valid Rasch- based psychometric properties except for targeting. Implications: The Rasch validated driving scale could be used to measure and compare driving abilities of individuals with amblyopia and/or strabismus.