[II: Difference plots or scattergram--when to use which?].

Abstract:

:Sometimes the statistical comparison of diagnostic measurement methods or subsequent measurement series in the same individuals is based on bivariate scattergrams; correlation coefficients and linear regression lines are provided in addition. However, this strategy for data representation must be considered inappropriate, as soon as the measurement series under consideration show the same physical index (e.g. repeated measurement of the intraocular pressure [mm Hg] 2 and 4 weeks after glaucoma surgery). Such data can be handled by computation of the intraindividual difference of an individual's measurement. The resulting series of intraindividual deviations can then be analysed using standard strategies: description can be based on the intraindividual differences' median and quartiles, graphical representation on the differences' distribution's box whisker plot. This procedure is particularly attractive for data arising from ophthalmological studies, when two eyes of one patient are to be compared. The statistical comparison of diagnostic methods can further be based on the Bland/Altman diagram, which not only illustrates the distribution of differences, but also motivates a dependence between the order of deviations and the absolute order of the measurement values. Whereas a box plot of intraindividual differences and a Bland/Altman diagram illustrate the concordance of two measurement series, the correlation scattergram rather visualizes their reproducibility.

journal_name

Klin Monbl Augenheilkd

authors

Krummenauer F

doi

10.1055/s-2002-35165

subject

Has Abstract

pub_date

2002-09-01 00:00:00

pages

682-5

issue

9

eissn

0023-2165

issn

1439-3999

journal_volume

219

pub_type

杂志文章
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    authors: Kommerell G,Mattheus S,Mühlendyck H

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  • [Periocular sub-tenon triamcinolone acetonide injections for the treatment of retinal angiomatous proliferation (RAP) and occult choroidal neovascularisation].

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  • [New Developments in Cataract Surgery].

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  • [Implant Design by Means of Multiphoton Polymerization].

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    authors: Giessler S,Gross M,Struck HG

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  • [Quality of Life in Patients with Glaucoma].

    abstract:BACKGROUND:The goal of glaucoma treatment is to maintain the patient's visual function and related quality of life, at a sustainable cost. In this review, methods of measuring quality of life are presented, together with their impact in clinical practice. METHODS:Searches were from the inception of the database to dat...

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  • Increasing the size of a small peripheral iridotomy widens the anterior chamber angle: an ultrasound biomicroscopy study.

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  • [The phenotype of heterozygotic females in congenital red-green color blindness (author's transl)].

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  • [Ocular Manifestation of Mucopolysaccharidosis I-S (Scheie's Syndrome)].

    abstract:BACKGROUND:Bilateral stromal corneal opacifications are a differential diagnostical challenge to identify associated systemic diseases. CASE-REPORT:A 47-year old civil engineer (height 167 cm) with bilateral stromal corneal clouding presented with visual loss for the last 27 years: VA 20/100 OD and 20/50 OS (following...

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  • [Perimetric diagnosis of chiasmal injury after contusion of skull and brain (author's transl)].

    abstract::After a discussion of the pathomechanism of skull trauma by a blow leading to chiasmal lesion, frontobasal injuries of the skull are considered; it is shown that typical defects of the visual field resulting from chiasmal damage can be revealed not only in cases of serious industrial or traffic accidents with brain co...

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  • [Abnormal head turn in a patient with Brown's syndrome].

    abstract:BACKGROUND:We report on an eight-year-old boy, who was presented in our clinic because of head turn. The cause of the tortecollis (ocular or general) in this case was and still cannot be explained. Only by applying extensive prism adaptation tests it was possible to prove the ocular character of the head turn. CASE RE...

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  • [The effect of lens haptics on postoperative anterior chamber depth in PMMA posterior chamber lenses].

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