![]() However, as stated by Bland & Altman(2), the mean difference represents only the bias between two methods used to measure the same variable on the same subjects: it shows whether one method gives consistently higher or lower values than the other. ![]() This conclusion appear to be based on the mean differences found using Bland & Altman statistical analysis (which consists of plotting the differences between in-office VA measurements and at-home VA test for each participant, against the average of both values).īearing in mind that each line of letters corresponds to a variation of 0.1 logMAR VA score, the mean differences found in the study (in logMAR units) were indeed within 1 line: −0.07 for the printed chart, −0.12 for the mobile phone app and −0.13 for the website test. “The 3 at-home VA test results (printed chart, mobile phone app, and website) appeared comparable within 1 line to in-office VA measurements”. In a recent article on a validation study of 3 home visual acuity (VA) tests for telehealth (a printed chart, a mobile phone app, and a website test), the authors concluded:(1) Shared Decision Making and Communication.Scientific Discovery and the Future of Medicine.Health Care Economics, Insurance, Payment. ![]() Clinical Implications of Basic Neuroscience.Challenges in Clinical Electrocardiography.
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