Littérature scientifique sur le sujet « Intra-Class correlation coefficient »
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Articles de revues sur le sujet "Intra-Class correlation coefficient"
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Pal, Nabendu, et Wooi K. Lim. « On intra-class correlation coefficient estimation ». Statistical Papers 45, no 3 (juillet 2004) : 369–92. http://dx.doi.org/10.1007/bf02777578.
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Caceres, Alejandro, Deanna L. Hall, Fernando O. Zelaya, Steven C. R. Williams et Mitul A. Mehta. « Measuring fMRI reliability with the intra-class correlation coefficient ». NeuroImage 45, no 3 (avril 2009) : 758–68. http://dx.doi.org/10.1016/j.neuroimage.2008.12.035.
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Flavell, Carol A., Laurence G. Marshman et Susan J. Gordon. « Measurement of transversus abdominis activation in chronic low back pain patients using a novel standardized real-time ultrasound imaging method ». Ultrasound 27, no 1 (5 juillet 2018) : 31–37. http://dx.doi.org/10.1177/1742271x18785403.
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Real-time ultrasound imaging (US) to measure abdominal muscle dimensions has aided low back pain rehabilitation and research. Notwithstanding, ultrasound imaging measurement of transversus abdominis muscle activation in chronic low back pain populations has been characterized by variable and generally suboptimal intra-observer reliability. Methodological deficiencies of ‘freehand’ ultrasound imaging are uncontrolled probe–skin pressure, inclination and roll of the probe. Despite previous attempts to standardize these parameters, intra-observer reliability in chronic low back pain was poor to moderate (0.32–0.62). Therefore, a standardized method that controls and records probe force, inclination and roll during ultrasound imaging may optimize measurement reliability in chronic low back pain. This pilot study investigated utility, standardization and intra-observer reliability of ultrasound imaging transversus abdominis thickness measurement in chronic low back pain patients (n = 17). Transversus abdominis imaging over two separate measurement sessions was conducted using a novel method to standardize probe parameters. Resting and contracted transversus abdominis thickness, and transversus abdominis activation measurements were obtained from duplicate paired images (n = 68). Intra-class correlation coefficients were reported with 95% confidence intervals. Transversus abdominis thickness at rest (intra-class correlation coefficient = 0.97 confidence interval: 0.93, 0.99), when contracted (intra-class correlation coefficient = 0.99 confidence interval: 0.97, 0.99) and transversus abdominis activation (intra-class correlation coefficient = 0.93 confidence interval: 0.81, 0.97) measurements were highly reliable. Ultrasound imaging of transversus abdominis using the novel standardized ultrasound imaging method produced highly reliable intra-observer transversus abdominis measurements, superior to ‘freehand’ ultrasound imaging, despite the physical limitations typically associated with a chronic low back pain population. Unique standardizing ranges for ‘probe force device’ probe parameters were obtained. This novel standardized ultrasound imaging method may optimize transversus abdominis activation assessment in chronic low back pain and other populations, aiding future research.
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Matthew, Jacqueline, Christina Malamateniou, Caroline L. Knight, Kelly P. Baruteau, Tara Fletcher, Alice Davidson, Laura McCabe, Dharmintra Pasupathy et Mary Rutherford. « A comparison of ultrasound with magnetic resonance imaging in the assessment of fetal biometry and weight in the second trimester of pregnancy : An observer agreement and variability study ». Ultrasound 26, no 4 (29 janvier 2018) : 229–44. http://dx.doi.org/10.1177/1742271x17753738.
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Objective To compare the intra and interobserver variability of ultrasound and magnetic resonance imaging in the assessment of common fetal biometry and estimated fetal weight in the second trimester. Methods Retrospective measurements on preselected image planes were performed independently by two pairs of observers for contemporaneous ultrasound and magnetic resonance imaging studies of the same fetus. Four common fetal measurements (biparietal diameter, head circumference, abdominal circumference and femur length) and an estimated fetal weight were analysed for 44 ‘low risk’ cases. Comparisons included, intra-class correlation coefficients, systematic error in the mean differences and the random error. Results The ultrasound inter- and intraobserver agreements for ultrasound were good, except intraobserver abdominal circumference (intra-class correlation coefficient = 0.880, poor), significant increases in error was seen with larger abdominal circumference sizes. Magnetic resonance imaging produced good/excellent intraobserver agreement with higher intra-class correlation coefficients than ultrasound. Good interobserver agreement was found for both modalities except for the biparietal diameter (magnetic resonance imaging intra-class correlation coefficient = 0.942, moderate). Systematic errors between modalities were seen for the biparietal diameter, femur length and estimated fetal weight (mean percentage error = +2.5%, −5.4% and −8.7%, respectively, p < 0.05). Random error was above 5% for ultrasound intraobserver abdominal circumference, femur length and estimated fetal weight and magnetic resonance imaging interobserver biparietal diameter, abdominal circumference, femur length and estimated fetal weight (magnetic resonance imaging estimated fetal weight error >10%). Conclusion Ultrasound remains the modality of choice when estimating fetal weight, however with increasing application of fetal magnetic resonance imaging a method of assessing fetal weight is desirable. Both methods are subject to random error and operator dependence. Assessment of calliper placement variations may be an objective method detecting larger than expected errors in fetal measurements.
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Dobbin, Kevin K., et Alexei C. Ionan. « Sample size methods for constructing confidence intervals for the intra-class correlation coefficient ». Computational Statistics & ; Data Analysis 85 (mai 2015) : 67–83. http://dx.doi.org/10.1016/j.csda.2014.11.010.
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Kotwani, Seema, D. N. Bid, Dinesh Ghatamaneni, Khalid A. Alahmari, Thangamani Ramalingam et S. Paul Silvian. « Determining the reliability of craniocervical flexion test in asymptomatic individuals ». Hong Kong Physiotherapy Journal 38, no 01 (juin 2018) : 33–40. http://dx.doi.org/10.1142/s101370251850004x.
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Background: The inter-rater reliability of the craniocervical flexion test (CCFT) has not been established. Objective: To investigate the intra-rater and inter-rater reliabilities of the CCFT in asymptomatic subjects. Methods: Sixty asymptomatic subjects were randomly selected for the study. The CCFT was measured on each subject by two testers for inter-rater reliability and by one of the testers after a gap of seven days for the intra-rater reliability. Before testing, the participants were trained for the movement and compensations were corrected. Results: The CCFT has high inter-rater reliability (intra-class correlation coefficient [Formula: see text] 0.907, standard error of mean [Formula: see text] 0.735) and high intra-rater reliability (intra-class correlation coefficient [Formula: see text] 0.986, standard error of mean [Formula: see text] 0.287). A Bland & Altman limits of agreement analysis has confirmed the high inter- and intra-rater reliabilities of the test. Conclusion: The CCFT has high inter-rater and intra-rater reliabilities in asymptomatic subjects.
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Suzuki, T., Y. Sato, S. Sotome, H. Arai, A. Arai et H. Yoshida. « Intra- and inter-tester reliability and validity of normal finger size measurement using the Japanese ring gauge system ». Journal of Hand Surgery (European Volume) 42, no 5 (1 décembre 2016) : 511–15. http://dx.doi.org/10.1177/1753193416680562.
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This study was designed to investigate the reliability and validity of measurements of finger diameters with a ring gauge. A reliability study enrolled two independent samples (50 participants and seven examiners in Study I; 26 participants and 26 examiners in Study II). The sizes of each participant’s little fingers were measured twice with a ring gauge by each examiner. To investigate the validity of the measurements, five hand therapists compared the finger size and hand volume of 30 participants with the ring gauge and with a figure-of-eight technique (Study III). The intra-class correlation coefficient for intra-observer reliability ranged from 0.97 to 0.99 in Study I, and 0.90 to 0.97 in Study II. The intra-class correlation coefficient for inter-observer reliability was 0.95 in Study I and 0.94 in Study II. The validity study showed a Pearson product moment correlation coefficient of 0.75. The ring gauge showed high reliability and validity for measurement of finger size. Level of evidence: III, diagnostic
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Lee, Gyu-wan, Chung-hwi Yi, Gyoung-mo Kim, Young-jung Lee et Jang-whon Yoon. « Cross-cultural adaptation and clinical evaluation of a Korean version of the Work, Osteoarthritis or joint-Replacement Questionnaire ». International Journal of Therapy and Rehabilitation 26, no 5 (26 mai 2019) : 1–8. http://dx.doi.org/10.12968/ijtr.2018.0120.
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Background and aim The Work Osteoarthritis or joint-Replacement Questionnaire (WORQ) is a new assessment tool developed in the Netherlands. It needs translation and cross-cultural adaptation for use in each country. The aim of this study was to translate the Work Osteoarthritis or joint-Replacement Questionnaire into Korean and to verify its reliability and validity. Methods To evaluate the clinimetric quality of the Korean-WORQ, we performed tests for internal consistency (Cronbach's alpha), reliability (intra-class correlation coefficients) and concurrent validity (Spearman's correlation coefficient). Factor analysis was carried out to identify the principal components of the questionnaire. Findings Both the internal consistency and intra-class correlation coefficients showed the reliability of the Korean-WORQ to be excellent. The Korean-WORQ had a strong positive correlation with the Western Ontario and McMaster Universities Osteoarthritis Index and three components were extracted in factor analysis. Conclusions Based on these results, the Korean-WORQ seems to be a suitable questionnaire for assessing the disability levels of patients with knee injuries.
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de Araujo Barbosa, Paulo Henrique Ferreira, Lidiane Teles de Menezes, Abraão Souza Costa, Clarissa Cardoso Santos Couto Paz, Henrique Resende Martins et Emerson Fachin-Martins. « Reliability of upright weight-bearing distribution measures obtained by computed baropodometry for participants with and without post-stroke hemiparesis ». International Journal of Therapy and Rehabilitation 26, no 11 (2 novembre 2019) : 1–12. http://dx.doi.org/10.12968/ijtr.2018.0026.
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Background/Aims Measurements from force platforms and digital scales have been applied to classify weight-bearing distribution in post-stroke hemiparesis. However, an intermediate tool – computed baropodometry – is breaking new ground in this field of diagnosis, with a need to report its reliability. Intra-test and test/retest reliabilities of the percentage of total body weight borne by the predominantly used hemibody calculated from computed baropodometry in participants with and without chronic hemiparesis was investigated in this study. Methods A total of 40 participants were evaluated and combined for age and sex in two different groups. Repeated measures were taken to analyse differences among records obtained from averages during 5, 10 or 20 seconds (intra-test reliability) and between the test and 1-week retest (test/retest reliability) for both groups. The analysis of variance, intra-class correlation coefficient and data plotted by Bland-Altman method were administrated. Results The intra-test analysis did not show differences among records obtained from different time durations (5, 10 and 20 seconds). Excellent to moderate intra-class correlation coefficient values (0.794 to 0.644) between test and retest were observed in the hemiparesis group from the records obtained by short to the longer lasting time durations, while for control groups, intra-class correlation coefficient values (0.661 to 0.748) were classified as moderate. Conclusions Acceptable reliability was found for all participants. Moreover, improved repeatability was reported when the measures were obtained by shorter time periods for both groups.
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Yadav, Manoj K., et Girdhar G. Agarwal. « On Estimation of Standard Error of Intra-Class Correlation Coefficient in Unbalanced Nested Designs ». Communications in Statistics - Theory and Methods 42, no 1 (janvier 2013) : 88–97. http://dx.doi.org/10.1080/03610926.2011.575513.
Texte intégralThèses sur le sujet "Intra-Class correlation coefficient"
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Bourredjem, Abderrahmane. « Contribution à l'inférence sur le coefficient de corrélation intraclasse de concordance dans les études de fiabilité inter-juges ». Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCK078.
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La fiabilité d'une mesure fait référence à sa reproductibilité lorsqu'elle est répétée de manière aléatoire sur le même sujet et constitue une propriété métrologique clé pour toutes les mesures. Le coefficient de corrélation intra-classe de concordance à deux voies (ICCa) est un paramètre statistique utilisé pour quantifier la fiabilité inter-observateurs des mesures continues (ou qualitatives ordinales). Il constitue un indice de fiabilité central recommandé par les agences réglementaires. Néanmoins, ses estimateurs sont biaisés et de nombreuses solutions ont été essayées pour améliorer son intervalle de confiance (IC). Les travaux les plus récents indiquent qu'aucune méthode ne fonctionne bien en cas de non-normalité des données, difficilement détectable à partir des observations, et lorsque le nombre de sujets ou d'évaluateurs est limité, ce qui est plutôt le cas en pratique. De plus, aucune transformation de stabilisation de la variance (VST) ni aucun test de comparaison statistique ne sont disponibles pour l'ICCa. L'objectif de cette thèse est donc de contribuer au développement de méthodes palliant le manque d'outils inférentiels pour l'ICCa. Dans un premier temps, nous proposons de nouvelles méthodes asymptotiques pour l'intervalle de confiance de l'ICCa, le calcul de la taille de l'échantillon des sujets et des évaluateurs, et un test de rapport de vraisemblance pour comparer deux ICCa. Ensuite, dans un deuxième travail, nous développons trois VST, améliorant les propriétés de l'intervalle de confiance pour les études de fiabilité inter-évaluateurs de taille modérée, et la synthèse de plusieurs ICCa dans le contexte de méta-analyses. Enfin, dans un troisième travail, des méthodes de rééchantillonnage spécifiques sont proposées, en combinaison avec la meilleure VST, pour améliorer les performances de l'intervalle de confiance de l'ICCa sans l'hypothèse de normalité et avec de petits échantillons. Il s'agit d'un travail de méthodologie biostatistique, avec des évaluations par simulation des méthodes introduites, et des applications à plusieurs jeux de données réelles issues d'études de fiabilité inter-évaluateurs et de méta-analysesMeasurement's reliability refers to its reproducibility when it is randomly repeated on the same subject and is a key metrological property for each measurement validation. The two-way intra-class correlation coefficient of agreement (ICCa) is a statistical parameter used to quantify the inter-rater reliability of continuous (or ordinal qualitative) measurements. It constitute a central reliability index recommended by the regulatory agencies. Nevertheless, its estimators are biased and a lot of solutions have been tried facing to its confidence interval (CI) problem. The latest works indicate that no method works well with a hard-to-detect violation of normality and when the number of subjects OR raters is limited, which is rather the case in practice. Furthermore, no variance stabilizing transformation (VST) nor statistical comparative test are available for the ICCa. The aim of this thesis is therefore to contribute to the development of methods that remedy the lack of the inferential tools for the ICCa. At a first step, we propose new asymptotic methods for the ICCa confidence interval, the calculation of the needed sample size of subjects and raters, and a likelihood ratio test to compare two ICCa. Then, in a second work, we develop three VSTs, improving the properties of the confidence interval for inter-rater reliability studies of moderate sample size, and the synthesis of several ICCa in the context of meta-analyses. Finally, in a third work, dedicated resampling methods are proposed, in combination with the best VST, to improve the ICCa confidence interval performances in case of non-normality with small sample size. It is above all a work of biostatistical methodology, with simulation evaluations of the introduced methods, and applications to several real data sets from inter-rater reliability studies and meta-analyses
Chapitres de livres sur le sujet "Intra-Class correlation coefficient"
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Lam, TP, H. Pang, YS Wong, BHK Yip, ALH Hung, WCW Chu, KKL Lai, YP Zheng et JCY Cheng. « Is ultrasound accurate for radiation-free quantitative assessment of spinal curvatures in patients with idiopathic scoliosis – a systematic review and meta-analysis ». Dans Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210446.
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Despite application of ultrasound for quantitative measurement of spinal curvatures has been reported with various studies, a systematic review for such is lacking. This systematic review aimed to evaluate (1) reliability of ultrasound; (2) validity of ultrasound using radiographic measurement as gold standard in idiopathic scoliosis patients; and (3) the use of various anatomical landmarks for measurement of spinal curvatures. MEDLINE, EMBASE, CINAHL, and CENTRAL databases were searched. QUADAS-2 quality assessment tool was adopted. Reliability of ultrasound in terms of intra-class correlation coefficient was recorded. Pearson correlation coefficients between ultrasound and radiographic measurements were extracted for meta-analysis. Subgroup analyses based on ultrasound measurement protocols of spinous process (SP), transverse processes (TP) and center of lamina (COL) were conducted. Eleven articles reporting 18 correlation analyses on 766 subjects were eligible for meta-analysis. The mean inter-rater reliability of ultrasound measurement was 0.87±0.07. Pooled correlation for all studies was 0.918 (95% CI: 0.868–0.949), exhibiting substantial heterogeneity (I2=90.50%, p<0.001). Subgroup analyses showed that pooled correlations were 0.887 for COL method (comprising 356 subjects); 0.924 for SP method (255 subjects); and 0.941 for TP method (117 subjects); all with notable heterogeneity (I2>90%, p<0.001). The overall risk of bias was rated moderate; yet publication bias was noted. Evidences showed that ultrasound was a promising non-invasive method with satisfactory validity and reliability for measuring coronal curvatures utilizing the SP, TP or COL methods. Further development of three-dimensional ultrasound towards scoliosis assessment will facilitate its translational application for managing scoliosis.
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« Intra-Class Correlation Coefficients ». Dans Handbook of Disease Burdens and Quality of Life Measures, 4241. New York, NY : Springer New York, 2010. http://dx.doi.org/10.1007/978-0-387-78665-0_5945.
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Wong, MS, et HD Wu. « A purpose-design computational method for estimation of plane of maximum curvature in Adolescent Idiopathic Scoliosis ». Dans Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210432.
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Adolescent idiopathic scoliosis (AIS) is a complex three-dimensional (3D) deformity, and the plane of maximum curvature (PMC) is proposed to reflect these clinical features, which refers to a vertical plane presenting the maximum projected spinal curvature and its parameters include the PMC Cobb and orientation (angle between PMC and sagittal planes). This study aimed to develop a computational method (CM) for PMC estimation. Twenty-nine patients with AIS and computed tomography (CT) images were recruited. For CT, PMC was determined by rotating a vertical plane about its vertical axis with 5° increment until the maximum Cobb angle was measured. For CM, PMC was estimated via identifying the eight points (the corner points of the superior and inferior endplates of the upper and lower end-vertebrae respectively) in the coronal and lateral CT images. Two experienced raters repeated the PMC estimation three times with one-week interval. The intra-class correlation coefficient (ICC) and Bland-Altman method were used for statistical analysis. Twenty-seven right thoracic curves (RTs) (mean Cobb: 46.1°±12.4°) and 23 left thoracolumbar/lumbar (LTLs/LLs) (mean Cobb: 30.6°±11.1°) were analysed. The intra- and inter-rater ICC values were >0.91 and 0.84 in RTs and LTLs/LLs, respectively. The PMCs obtained from the CM and CT were showed good agreement was also observed between the PMCs obtained from the two methods according to ICC (>0.90) and Bland-Altman method assessments. This purpose-design computational method could provide reliable and valid estimation of PMCs for AIS, which has potential to be used as an alternative for 3D assessment.
Actes de conférences sur le sujet "Intra-Class correlation coefficient"
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Silva, Fabiola Cristina Brandini, Almir José Sarri, Jonathas José Silva, Idam Oliveira-Junior et René Aloisio Costa Vieira. « VOLUMETRIC EVALUATION OF UPPER LIMB FOR THE BREAST CANCER ASSOCIATED LYMPHEDEMA ». Dans Scientifc papers of XXIII Brazilian Breast Congress - 2021. Mastology, 2021. http://dx.doi.org/10.29289/259453942021v31s1027.
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Introduction: Lymphedema is one of the main complications associated with the treatment of breast cancer. Multiple methodologies can be used in the diagnosis of lymphedema. A simple and clean, easy methodology is lacking, aiming to correlate with the findings of volumetry. Objectives: To evaluate different methodologies for the evaluation of indirect volumetry, by calculating the Frustrum and potential cutoff points related to direct volumetry. Methods: Study approved by the Ethics Committee under number 782/2014. A cross-sectional study with prospective collection, diagnostic evaluation, performed in patients with breast cancer undergoing surgical treatment of the breast. The participants were subjected to evaluations of the upper limbs using volumetry (total limb and hand), cylindrical and radial perimetry for diagnosis of lymphedema at equidistant points every 5 cm (V10) and 10 cm (V6). One software was created based on the cylindrical and diametrical measurements of the upper limbs. Concomitant upper limb and hand volumetry was performed, with a difference of 200 mL in volume being considered a lymphedema. The formula VFC=h(C12+C1C2 + C22)/12π was used for the cylindrical Frustrum (VFC), and for the elliptical Frustrum (VFE) the formula VFE= (Lπ/3)A2B-a2b)/(A-a) was used. To compare the agreement of the volumes, the Interclass Correlation Index was used. In order to equalize values associated with volumetry, the ROC curve was used. Grant from FAPESP project no. 2014 08197-0 and Institutional IEP/HCB no 5/2017. Results: 300 patients were evaluated. With regard to VFE, the result was not adequate in 25.5% in the V10 assessment and in 8.9% in the V6. The correlation between the difference in volume in total volume and the difference in volume without hands was excellent (ICC = 0.993). The difference of the risk member was compared with the contralateral of the VC10 and VC6 volumes with hand and VC10 and VC6 without the hand, the intra-class correlation coefficients were 0.840, 0.878, 0.835, 0.878, respectively. The presence or absence of the hand did not change the correlation, given the difference in volume (dV). Considering the difference in volume of the limbs of 200 mL, in the VFC formula dVC6 this value corresponded to 108.79 mL, with a sensitivity of 88.9, specificity of 87.3 and accuracy of 87.7; and in the VFC dVC10 formula this value was 96.9 mL, with a sensitivity of 92.1, specificity of 85.7 and accuracy of 87. Conclusions: The use of cylindrical Frustrum proved to be satisfactory, and different cutoff points should be used in clinical practice. The creation of the software facilitates the evaluation because it is a clean and reproducible methodology.
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Díaz Piedra, Carolina, Giulia De Cet, Alban Kuqi, M. Jesus Caurcel, Rocio Fernandez- Mendez, Riccardo Rossi et Leandro Luigi Di Stasi. « Assessment of fitness to drive in elderly and cognitively impaired drivers : Adaptation of the Driving Observation Schedule to simulated environments ». Dans AHFE 2023 Hawaii Edition. AHFE International, 2023. http://dx.doi.org/10.54941/ahfe1004343.
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We created a standardized assessment of fitness-to-drive in driving simulation environments through the adaptation of the Driving Observation Schedule (DOS; Vlahodimitrakou et al., 2013), which is a widely used instrument to assess “natural driving”. The Sim-DOS is an observational instrument that intends to overcome some of the practical limitations of the on-road assessment with dual control cars, in terms of safety, costs, and unpleasantness. Via expert consensus, the following was undertaken: (1) DOS behaviors were adapted to a simulated-based environment (signaling, observation of the environment, speed regulation, slow or unsafe reaction, distance interpretation, vehicle/lane positioning); (2) the Sim-DOS scores calculation, which is based on errors, was adapted from DOS to include hazard situations (HS) and free driving scores. The instrument was then piloted with a sample of 34 elderly drivers (70.9 ± 4.1 years old, 60% male, 46.1 ± 6.7 years of driving experience, 74% of them were regular drivers), along with the collection of simulator-produced data on number of harsh events and driving speed. Psychomotor skills of the majority were compromised, with only one participant being above the 80th percentile in the Reaction Times Test score of the Spanish mandatory driving assessment. Participants undertook two consecutive 20-minute long driving scenarios, with low and high traffic density (LTD, HTD). In each scenario, there were periods with and without potentially HS. Assessments were performed by two independent trained observers (intra-class correlation coefficients > 0.94). When exposed to HS, most participants (94.1%) did not perform well (more than nine minor errors), independent of traffic density, with average Sim-DOS HS scores of 12.70 ± 9.3. Compared to LTD scenarios, in HTD scenarios participants drove less smoothly, although slower (p-values<.05). The latter improved their ability to manage hazard situations, thus producing better than expected Sim-DOS scores. During free driving, participants drove more smoothly but performed worse under LTD conditions, driving at higher speed (p-values<.05). Our study provides a validated driving assessment tool for use in driving simulators that will allow for a safer, more ecologic, holistic and informative evaluation of the fitness-to-drive of older adults and patients with neurologic conditions.