Reliability Measurement of Corneal Wavefront Aberrations using Corneal Videokeratograph Atlas 9000

Introduction: Accurate corneal wavefront aberration measurements are essential in determining patient’s suitability, vision outcomes and patient satisfaction in laser refractive surgeries. This study aimed to evaluate the reliability measurement of higher-order aberration (HOA) using corneal videokeratograph Atlas 9000. Materials and method: 38 eyes of 19 participants were recruited in this study. Comprehensive eye examination was done to ensure all participants eligibility, and any conditions in which obstruct the central cornea were excluded. Corneal wavefront aberrations were measured based on Zernike polynomials. In assessing repeatability, three repetitive measurements in five minutes in a single session were taken by 2 experience examiners. For reproducibility measurement, similar approach was done with the time-interval between measurements was set at one week. Bland-Altman, limits of agreement (LoA) and intraclass correlation coefficients (ICCs) were used to evaluate the reliability measurement. Results: Bland-Altman and LoA findings revealed no significant differences for both repeatability and reproducibility measurement. For repeatability testing, the mean differences for vertical trefoil, oblique trefoil and spherical aberration were -0.096 ± 0.493, 0.001 ± 0.048, 0.008 ± 0.035, 0.004 ± 0.029, 0.010 ± 0.053 with LoA of 1.930, 0.188, 0.138, 0.114, and 0.208 respectively. Intraclass correlation coefficient (ICC) excellent reliability of 0.841 for all parameters. Likewise, reproducibility testing showed similar findings with the mean difference were -0.018 ± 0.091, 0.016 ± 0.061, -0.0004 ± 0.036, -0.002 ± 0.042, 0.003 ± 0.026, with LoA of 0.356, 0.24, 0.141,0.164, and 0.102 respectively. Intraclass correlation coefficient (ICC) shows excellent reliability of more than 0.9 for all parameters. LoA of less than 1.0 were observed in all measurements (except for repeatability of vertical trefoil) indicates high consistency of the measurements. Conclusions: Corneal videokeratograph Atlas 9000 provides excellent HOA measurement reliability.

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Reliability of the qualitative and semiquantitative nailfold videocapillaroscopy assessment in a systemic sclerosis cohort: a two-centre study

Annals of the Rheumatic Diseases ◽

10.1136/ard.2009.115568 ◽

2010 ◽

Vol 69 (6) ◽

pp. 1092-1096 ◽

Cited By ~ 97

Author(s):

Vanessa Smith ◽

Carmen Pizzorni ◽

Filip De Keyser ◽

Saskia Decuman ◽

Jens T Van Praet ◽

...

Keyword(s):

Systemic Sclerosis ◽

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Rater Agreement ◽

Nailfold Videocapillaroscopy ◽

Intraclass Correlation Coefficients ◽

The Mean ◽

Scleroderma Pattern

ObjectiveInvestigation of the reliability of the qualitative and semiquantitative scoring of nailfold videocapillaroscopy (NVC) assessment between two raters in a systemic sclerosis (SSc) cohort.MethodsTwo raters from different centres blindly assessed the NVC images of 71 consecutive patients with SSc qualitatively as belonging to the scleroderma spectrum (SDS) category (‘early’, ‘active’, ‘late’ scleroderma pattern or ‘scleroderma-like’ pattern) or to the ‘normal’ category and semiquantitatively by calculating the mean score for capillary loss, giant capillaries, microhaemorrhages and capillary ramifications. Inter-rater/intrarater agreement was assessed by calculation of the proportion of agreement and by κ coefficients. Rater agreement of mean score values of hallmark parameters was assessed by intraclass correlation coefficients.ResultsThe inter-rater/intrarater proportion of agreement to qualitatively assess an image as belonging to the SDS category or not was 90% and 96%, whereas the agreement to distinguish between only ‘early’, ‘active’ and ‘late’ scleroderma NVC patterns was 62% and 81%. The agreement of the semiquantitative scoring, as assessed by intraclass correlation coefficient, was 0.96 and 0.95 for capillary loss, 0.84 and 0.95 for giant capillaries, 0.90 and 0.95 for microhaemorrhages and 0.64 and 0.95 for capillary ramifications.ConclusionsThis is the first study to demonstrate reliability of the qualitative and semiquantitative NVC assessment in an SSc cohort between raters at different centres. Reliability of NVC assessment is essential for use of this tool in multicentre SSc trials.

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AB0798 IS THERE A REPRODUCIBILITY OF THE HISTOGRAM AND GRAY SCALE IN ECOEXTRUCTURAL DAMAGES IN RHEUMATOTOLOGICAL DISEASES?

Annals of the Rheumatic Diseases ◽

10.1136/annrheumdis-2021-eular.3269 ◽

2021 ◽

Vol 80 (Suppl 1) ◽

pp. 1423.2-1424

Author(s):

J. A. Mendonça ◽

I. Siste de Almeida Aoki ◽

C. C. Cavuto ◽

V. A. Leandro-Merhi ◽

J. L. B. D. Aquino

Keyword(s):

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Rheumatic Diseases ◽

Femoral Condyle ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Concordance Correlation Coefficient ◽

Image Method ◽

Concordance Correlation ◽

Gray Scale

Background:The gray scale (GS) in high resolution ultrasound is already well validated for use in rheumatological diseases, but the color map or the histogram, can be considered a new proposal, to better define and complement the echotextural damages detection1.Objectives:To calculate the lesions area measures reproducibility index in arthropathies, between 3 blind evaluators and correlate these measures using the GS and the histogram.Methods:Observational and retrospective study approved by the ethics committee of the Pontifical Catholic University of Campinas, with the opinion number: 1.526.307. A total of 29 patients have been assessed (31% males and 69% females) on period 2014 to 2019 in Rheumatology service. A MyLab 50 -Esaote equipment was used with frequency transducer that ranged between 6.0 and 18.0 MHz, 10 different area measures were performed from each recorded images previously, by the GS and the histogram. Statistical analysis: Spearman’s correlation coefficients, Lin’s concordance coefficient (CCC) and the intraclass correlation coefficient (ICC) and their respective 95% confidence intervals, with the SPSS software package for Windows v. 17.0 (SPSS Inc., Chicago, IL, USA).Results:Average age 43.5 ± 21.5 years of age; with disease duration that varied between ≤ 1 month (48.3%) and ≥36 months (24.1%); with the following diseases: juvenile idiopathic arthritis (17.24%); osteoarthritis (13.79%); psoriatic arthritis (13.79%); undifferentiated spondyloarthritis (3.44%); gout (20.68%); rheumatoid arthritis (27.58%) and reactive arthritis (3.44%). A total of 840 measures of exudative (27.58%), proliferative (27.58%) and snowstorm appearance (6.89%) synovitis were performed; femoral-condyle cartilage (3.44%); synovial cyst (3.44%); paratendinitis (6.89%); calcification (3.44%); nail enthesitis (3.44%); tenosynovitis (6.89%) and tophi (10.34%) (Figure 1). The concordance correlation coefficient showed values closer to 1; p <0.001, the intraclass correlation coefficients with excellent reproducibility (ICC ≥ 0.75); p <0.001, always in relation to the three evaluators (Table 1) and the Spearman correlation between the GS and the histogram ranged from rs = 0.665 to rs = 1,000; p <0.001.Conclusion:The histogram can be considered an image method to better identify echotextural damages.References:[1]Mendonça J, Provenza J, Guissa V, et al AB1059 2D Histogram Ultrasound and 3D Ultrasound Correlation in Rheumatic Diseases Annals of the Rheumatic Diseases 2015; 74:1253-1254.Table 1.Concordance Correlation Coefficient (CCC) and Intraclass Correlation Coefficient (ICC):EvaluatorsGS - CCC(IC 95%)p-valorHistogram (IC 95%)p-valor1 e 20,998(0,994-0,999)<0,0010,999(0,995-1,000)<0,0011 e 30,998(0,995-0,999)<0,0010,999(0,995-1,000)<0,0012 e 30,992(0,980-0,997)<0,010,996(0,979-0,999)<0,01Standard by US 2DICCp-valorGS0,997(0,992-0,999)<0,001Histogram0,998(0,992-0,999)<0,001Legends: Gray Scale (GS).Figure 1.Patient with gout: A and B: Tophi area measures (star) in right metatarsos and efusion (arrow) by GS (45 mm2) and histogram (39 mm2), respectively.Disclosure of Interests:José Alexandre Mendonça Speakers bureau: Novartis, Janssen, Bristol, UCB, Isabella Siste de Almeida Aoki: None declared, Caique Chagas Cavuto: None declared, Vânia Aparecida Leandro-Merhi: None declared, José Luis Braga de Aquino: None declared

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A Quantitative Comparison of Multispectral Refraction Topography and Autorefractometer in Young Adults

Frontiers in Medicine ◽

10.3389/fmed.2021.715640 ◽

2021 ◽

Vol 8 ◽

Author(s):

Yunru Liao ◽

Zhenlan Yang ◽

Zijing Li ◽

Rui Zeng ◽

Jing Wang ◽

...

Keyword(s):

Correlation Coefficient ◽

Pearson Correlation ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Cross Sectional Study ◽

Cross Sectional ◽

High Agreement ◽

Intraclass Correlation Coefficients ◽

Repeatability And Reproducibility ◽

The Mean

Purpose: Purpose of this study is to evaluate the measuring consistency of central refraction between multispectral refraction topography (MRT) and autorefractometry.Methods: This was a descriptive cross-sectional study including subjects in Sun Yat-sen Memorial Hospital from September 1, 2020, to December 31, 2020, ages 20 to 35 years with a best corrected visual acuity of 20/20 or better. All patients underwent cycloplegia, and the refractive status was estimated with autorefractometer, experienced optometrist and MRT. We analyzed the central refraction of the autorefractometer and MRT. The repeatability and reproducibility of values measured using both devices were evaluated using intraclass correlation coefficients (ICCs).Results: A total of 145 subjects ages 20 to 35 (290 eyes) were enrolled. The mean central refraction of the autorefractometer was −4.69 ± 2.64 diopters (D) (range −9.50 to +4.75 D), while the mean central refraction of MRT was −4.49 ± 2.61 diopters (D) (range −8.79 to +5.02 D). Pearson correlation analysis revealed a high correlation between the two devices. The intraclass correlation coefficient (ICC) also showed high agreement. The intrarater and interrater ICC values of central refraction were more than 0.90 in both devices and conditions. At the same time, the mean central refraction of experienced optometrist was −4.74 ± 2.66 diopters (D) (range −9.50 to +4.75D). The intra-class correlation coefficient of central refraction measured by MRT and subjective refraction was 0.939.Conclusions: Results revealed that autorefractometry, experienced optometrist and MRT show high agreement in measuring central refraction. MRT could provide a potential objective method to assess peripheral refraction.

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The Reliability of the Manual Supination Resistance Test

Journal of the American Podiatric Medical Association ◽

10.7547/87507315-93-3-185 ◽

2003 ◽

Vol 93 (3) ◽

pp. 185-189 ◽

Cited By ~ 18

Author(s):

Hazel Noakes ◽

Craig Payne

Keyword(s):

Clinical Outcomes ◽

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Resistance Test ◽

Foot Orthoses ◽

Good Reliability ◽

Intraclass Correlation Coefficients ◽

Foot Pronation

Several decisions need to be made when prescribing foot orthoses for abnormal foot pronation. One of these decisions is how much force is needed from orthoses to supinate the foot. The supination resistance test has been described as one technique to help determine the amount of force needed. The aim of this project was to determine the reliability of the manual supination resistance test. Four clinicians of differing levels of experience performed the test on 44 subjects (88 feet) on 2 separate days. The test had good reliability overall, with an intertester intraclass correlation coefficient of 0.89. For the two more experienced clinicians, the intratester intraclass correlation coefficients were good (0.82 and 0.78), but for the two inexperienced clinicians they were poor (0.56 and 0.62). The supination resistance test may be clinically useful in the prescription of foot orthoses, but more work is needed to determine its validity and its relationship to clinical outcomes. (J Am Podiatr Med Assoc 93(3): 185-189, 2003)

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Reliability of CBCT in the diagnosis of dental asymmetry

Dental Press Journal of Orthodontics ◽

10.1590/2176-9451.19.2.090-095.oar ◽

2014 ◽

Vol 19 (2) ◽

pp. 90-95 ◽

Cited By ~ 1

Author(s):

Antônio Carlos de Oliveira Ruellas ◽

Leonardo Koerich ◽

Carolina Baratieri ◽

Claudia Trindade Mattos ◽

Matheus Alves Junior ◽

...

Keyword(s):

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Measurement Errors ◽

Interobserver Reliability ◽

Intraclass Correlation ◽

Mean Difference ◽

Linear Measurements ◽

The Mean

Objective: The aim of this study was to validate a method used to assess dental asymmetry, in relation to the skeletal midline, by means of CBCT. Methods: Ten patients who had CBCT scans taken were randomly selected for this study. Five different observers repeated 10 landmarks (x, y and z variables for each) and 12 linear measurements within 10 days. Measurements were taken in both arches to evaluate symmetry of first molars, canines and dental midline in relation to the skeletal midline. Intraclass correlation coefficient (ICC) was carried out to assess intra- and interobserver reliability for landmarks and distances. Average mean difference was also assessed to check measurement errors between observers. Results: ICC landmarks was ≥ 0.9 for 27 (90%) and 25 (83%) variables for intra- and interobserver, respectively. ICC for distances was ≥ 0.9 for 7 (58%) and 5 (42%), respectively. All ICC landmarks for distances were >0.75 for both intra- and interobserver. The mean difference between observers was ≤ 0.6 mm for all the distances. Conclusion: The method used to assess dental asymmetry by means of CBCT is valid. Measurements of molars, canines and dental midline symmetry with the skeletal midline are reproducible and reliable when taken by means of CBCT and by different operators.

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The Intraclass Correlation Coefficient as a Measure of Reliability

Psychological Reports ◽

10.2466/pr0.1966.19.1.3 ◽

1966 ◽

Vol 19 (1) ◽

pp. 3-11 ◽

Cited By ~ 1278

Author(s):

John J. Bartko

Keyword(s):

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Variance Components ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Frequent Use ◽

Ratio Of Variances ◽

The One ◽

Definition Of ◽

Estimation Of Variance

A procedure for estimating the reliability of sets of ratings in terms of the intraclass correlation coefficient is discussed. The procedure is based upon the analysis of variance and the estimation of variance components. For the one-way classification the intraclass correlation coefficient defined as the ratio of variances can be interpreted as a correlation coefficient. Caution, however, is urged in the application of the definition to a two-way model, i.e., one in which between-rater variance is removed. It is maintained that the frequent use of the standard definition of the one-way intraclass correlation coefficient applied to the two-way classification is not a proper procedure if in fact the coefficient is to be interpreted as a correlation coefficient. Definitions for reliability obtained from the two-way models are given which can legitimately be considered correlation coefficients.

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Inter-surgeon variability in the identification of clock face landmarks when placing suture anchors in arthroscopic Bankart repair

Shoulder & Elbow ◽

10.1177/1758573218797964 ◽

2018 ◽

Vol 11 (6) ◽

pp. 419-423

Author(s):

Massimo Petrera ◽

Darrell J Ogilvie-Harris ◽

John S Theodoropoulos ◽

Jaskarndip Chahal ◽

David Wasserstein ◽

...

Keyword(s):

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Suture Anchor ◽

Shoulder Arthroscopy ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Moderate Degree ◽

Suture Anchors ◽

Intraclass Correlation Coefficients ◽

Average Position

Background The accuracy of surgeons in utilizing the clock face method for anchor placement has never been investigated. Our hypothesis was that shoulder arthroscopy surgeons would be able to place suture anchors at predetermined positions with accuracy and reliability. Methods Ten cadaveric shoulders were used. Five fellowship-trained shoulder arthroscopy surgeons were directed to place a suture anchor at 3:30, 4:30, and 5:30 clock in two shoulders each. The position of the anchors was determined with computed tomography. The accuracy of placement was calculated and data analyzed with one-way analysis of variance. The intraclass correlation coefficients were calculated. Results The overall accuracy was 57%. The accuracy of anchor placement at the 3:30 position was 40% (average position 2:24 o’clock), it was 50% at the 4:30 position (average position 3:42 o’clock) and 80% at the 5:30 position (average position 5:03 o’clock). No statistical difference in accuracy between the placement of the superior, middle, and inferior anchors (p = 0.145) was seen. The intraclass correlation coefficient for inter-surgeon reliability was 0.4 (fair) while the intraclass correlation coefficient for intra-surgeon reliability was 0.6 (moderate). Discussion The findings of this study suggest a moderate degree of accuracy and fair to moderate inter- and intra-surgeon reliability when using the clock face system to guide anchor placement.

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Precision of the virtual occlusal record

The Angle Orthodontist ◽

10.2319/092018-684.1 ◽

2019 ◽

Vol 89 (5) ◽

pp. 751-757 ◽

Cited By ~ 1

Author(s):

Keyan P. Botsford ◽

Michael C. Frazier ◽

Ahmed A. M. Ghoneima ◽

Achint Utreja ◽

Surya S. Bhamidipalli ◽

...

Keyword(s):

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Statistical Significance ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Normal Pressure ◽

Software Systems ◽

Kappa Statistics ◽

Intraoral Scanner ◽

Significant Difference

ABSTRACT Objectives: To evaluate the precision of the virtual occlusal record using the Carestream CS3600 Intraoral Scanner (Carestream Dental, Atlanta, Ga). Materials and Methods: A total of 20 participants were recruited for this prospective study using preestablished inclusion/exclusion criteria. A complete intraoral scan and two bite registrations were obtained. The participants were instructed to bite with normal pressure when bite registrations were acquired. Contact locations, size (circumference), and intensity were identified on the maxillary first molars and canines. Agreement between contact size and intensity was assessed with intraclass correlation coefficients. Kappa statistics evaluated agreement in contact locations. Statistical significance was set at P < .05. Results: All participant data were included for statistical analysis. Between the two bite registrations, nonstatistically significant differences were observed in the proportion of locations with contacts (P = .7681). A nonstatistically significant difference (−0.25 mm, P = .8416) in mean contact circumference size was observed. A statistically significant difference in mean contact intensity was observed (P = .0448). When evaluating agreement between the bite registrations, a weak correlation for size (intraclass correlation coefficient = 0.35) and intensity (intraclass correlation coefficient = 0.32) was observed as well as a moderate agreement for contact location (κ coefficient = 0.67). Conclusions: The findings suggest that the Carestream intraoral scanner software possesses adequate precision when acquiring the location and size of the contacts in bite registrations. The scanner failed to demonstrate adequate precision when acquiring contact intensities in bite registrations. Additional research is warranted to further investigate the precision of virtual occlusal records with currently available software systems.

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Correlation of the anatomical sacral slope with pelvic incidence in female patients with developmental hip dysplasia: A retrospective cross-sectional study

10.21203/rs.3.rs-33748/v2 ◽

2020 ◽

Author(s):

Norio Imai ◽

Hayato Suzuki ◽

Atsushi Sakagami ◽

Yuki Hirano ◽

Naoto Endo

Keyword(s):

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Healthy Subjects ◽

Lumbar Lordosis ◽

Pelvic Incidence ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Developmental Dysplasia ◽

Sacral Slope ◽

Dysplasia Of The Hip

Abstract Background: The anatomical sacral slope is considered as an anatomical pelvic parameter independent of femoral head centers for measurement of anatomical sacral slope and was previously described to strongly correlate with pelvic incidence on a two-dimensional examination of healthy subjects. However, the correlation between anatomical sacral slope and pelvic incidence was unclear in patients with developmental dysplasia of the hip. This study aimed to examine the correlation between anatomical sacral slope and other spinopelvic parameters by analyzing plain radiographs of female patients with developmental dysplasia of the hip. Methods: Eighty-four women with developmental dysplasia of the hip were examined. Lumbar lordosis, thoracic kyphosis, pelvic incidence, sacral slope, and anatomical sacral slope (the angle formed by the straight line of the S1 superior endplate and a line at a right angle to the anterior pelvic plane), were determined by analyzing plain radiographs. The correlations were examined by Pearson correlation coefficients, and intra- and inter-rater intraclass correlation coefficients were evaluated for reliability. Results: A strong correlation was observed between pelvic incidence and anatomical sacral slope (r=0.725, p<0.001). In addition, the correlation between anatomical sacral slope and lumbar lordosis was similar to that between pelvic incidence and lumbar lordosis (r=0.661, p<0.001 and r=0.554, p<0.001, respectively). The intra-rater intraclass correlation coefficient values were 0.869 and 0.824 for anatomical sacral slope and pelvic incidence, respectively. Furthermore, the inter-rater intraclass correlation coefficient values were 0.83 and 0.685 for anatomical sacral slope and pelvic incidence, respectively. Conclusions: We observed that the strong correlation between anatomical sacral slope and pelvic incidence in patients with developmental dysplasia of the hip was equal to that in normal healthy subjects. The correlation between anatomical sacral slope and lumbar lordosis was equal to that between pelvic incidence and lumbar lordosis. Additionally, the intraclass correlation coefficient values for the anatomical sacral slope were slightly higher than those for pelvic incidence. Thus, we conclude that anatomical sacral slope can be considered as a helpful anatomical pelvic parameter that is a substitute for pelvic incidence not only in normal healthy subjects, but also in patients with developmental dysplasia of the hip.

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Comparison between self-reported sleep duration and actigraphy among adolescents: gender differences

Revista Brasileira de Epidemiologia ◽

10.1590/1980-5497201600020011 ◽

2016 ◽

Vol 19 (2) ◽

pp. 339-347 ◽

Cited By ~ 12

Author(s):

Luciane Gaspar Guedes ◽

Gabriela de Azevedo Abreu ◽

Daniel Frossard Rodrigues ◽

Liliane Reis Teixeira ◽

Ronir Raggio Luiz ◽

...

Keyword(s):

Gender Differences ◽

Correlation Coefficient ◽

Sleep Duration ◽

Intraclass Correlation Coefficient ◽

Intraclass Correlation ◽

Age Group ◽

Subjective Measures ◽

Nocturnal Sleep ◽

Altman Plot ◽

The Mean

ABSTRACT: Introduction: There are only few agreement studies between subjective measures of sleep and actigraphy among adolescents. Objective: To compare self-reported sleep and actigraphy in this age group, by studying gender differences and, using a new graphical approach, the survival agreement plot. Methods: Thirty-seven subjects, aged 12 to 17 years, answered questions about nocturnal sleep duration and used actigraphy for seven days. The mean and median differences between the informed sleep and the recorded one, the intraclass correlation coefficient, the Bland-Altman plot and the survival-agreement plot were used. Results: A mean difference of about one hour (SD = 2.1; median = 0.5; p < 0.01) was found between both strategies, which was higher among boys, 1.9 hours (SD = 2.8; median = 1.6; p < 0.05), than among girls, 0.5 hours (SD = 1.4; median = 0.3; p = 0.11). The graphical evaluation showed similar results, as well as the intraclass correlation coefficient: 0.06 (95%CI = -0.33 - 0.46; p = 0.489) for boys and 0.43 (95%CI = 0.12 - 0.83; p < 0.001) for girls. Conclusions: Our data are consistent with previous studies as to non-agreement between the two methods. These results are relevant because this is the first study of concordance between subjective measures of sleep and actigraphy among Brazilian adolescents, as far as we know. In addition, they reinforce the need of a careful use of nocturnal sleep measures among adolescents, mainly among boys.

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