Intraobserver Reliability (intraobserver + reliability)

Distribution by Scientific Domains


Selected Abstracts


Digit ratios (2D:4D) determined by computer-assisted analysis are more reliable than those using physical measurements, photocopies, and printed scans

AMERICAN JOURNAL OF HUMAN BIOLOGY, Issue 3 2009
Heather C. Allaway
Prenatal androgens influence the second to fourth digit ratio (2D:4D) of hands with men having lower ratios than women. Numerous methods are used to assess 2D:4D including, physical measurements with calipers, and measurements made from photocopies, scanned images, digital photographs, radiographs, and scaled tubes. Although each method appears relatively reliable, agreement upon a gold standard is necessary to better explore the putative effects of prenatal androgens. Our objective was to assess the level of intra and interobserver reliability when evaluating 2D:4D using four techniques: (1) physical measurements, (2) photocopies, (3) printed scanned images, and (4) computer-assisted image analysis. Physical measurements, photocopies, and printed scanned images were measured with Vernier calipers. Scanned images were also measured with computer-based calipers. Measurements were made in 30 men and 30 women at two different time points, by three experienced observers. Intraclass correlation coefficients were used to assess the level of reliability. Intraobserver reliability was best for computer-assisted (0.957), followed by photocopies (0.939), physical measurements (0.925), and printed scans (0.842; P = 0.015). Interobserver reliability was also greatest for computer-assisted (0.892), followed by photocopies (0.858), physical measurements (0.795), and printed scans (0.761; P = 0.001). Mean 2D:4D from physical measurements were higher than all other techniques (P < 0.0001). Digit ratios determined from computer-assisted, physical measurements, and printed scans were more reliable in men than women (P = 0.009, P = 0.017, and P = 0.012, respectively). In summary, 2D:4D determined from computer-assisted analysis yielded the most accurate and consistent measurements among observers. Investigations of 2D:4D should use computer-assisted measurements over alternate methods whenever possible. Am. J. Hum. Biol., 2009. 2009 Wiley-Liss, Inc. [source]


How reliable is contact endoscopy of the nasopharynx in patients with nasopharyngeal cancer?

THE LARYNGOSCOPE, Issue 3 2009
Martin Wai Pak FRCS Ed (ORL)
Abstract Objectives/Hypothesis: To evaluate diagnostic reliability of contact rhinoscopy in patients with nasopharyngeal carcinoma. Study Design: A cross-sectional randomized single-blinded study was carried out to evaluate the reliability of the findings of contact rhinoscopy in patients with nasopharyngeal carcinoma assessed by different observers. Methods: Random images of contact endoscopy of 157 subjects including normal patients and patients with nasopharyngeal carcinoma, both prior to external beam radiation therapy (RT), the non-RT group, and after external beam radiation therapy, the post-RT group, were available for analysis. Three independent observers of varying clinical experience and histopathologic knowledge viewed the images and made a diagnosis for each image. The diagnosis of each image was correlated with the histology of the biopsy from the corresponding patient. Results: In the non-RT group, Kappa values for inter- and intraobserver reliability to differentiate normal epithelium from primary nasopharyngeal carcinoma were 0.894, 1.000, 0.794 and 0.694, 1.000, 0.776 for the house officer, radiologist, and pathologist, respectively. There were no significant differences in interobserver and intraobserver reliabilities between the assessors. In the post-RT group, Kappa values for the inter- and intraobserver reliability to diagnose recurrent carcinoma or atypia, squamous metaplasia, and radiation change for the three observers were 0.820, 0.718, 0.775 and 0.731, 0.622, 0.734, respectively. There were no significant differences in interobserver and intraobserver reliabilities between the assessors. Conclusions: The clinical diagnosis of nasopharyngeal carcinoma by contact endoscopy is highly reliable and is not dependent on the clinical experience or knowledge of histopathology of the observers. Laryngoscope, 119:523,527, 2009 [source]


The eczema area and severity index (EASI): assessment of reliability in atopic dermatitis

EXPERIMENTAL DERMATOLOGY, Issue 1 2001
J. M. Hanifin
Abstract:Objective, To test the reliability of the eczema area and severity index (EASI) scoring system by assessing inter- and intra-observer consistency. Design: Training of evaluators, application, and assessment over 2 consecutive days. Setting, An academic center. Patients, Twenty adults and children with atopic dermatitis (AD); cohort 1 (10 patients ,8 years) and cohort 2 (10 patients <8 years). Interventions, None. Main outcome measure, The EASI was used by 15 dermatologist evaluators to assess atopic dermatitis in cohort 1 and cohort 2 on 2 consecutive days. Inter- and intraobserver reliability were analyzed. Results, Overall intra-evaluator reliability of the EASI was in the fair-to-good range. Inter-evaluator reliability analyses indicated that the evaluators assessed the patients consistently across both study days. Conclusions, This study demonstrated that the EASI can be learned quickly and utilized reliably in the assessment of severity and extent of AD. There was consistency among the evaluators between consecutive days of evaluation. These results support the use of the EASI in clinical trials of therapeutic agents for AD. [source]


Differentiating Atrioventricular Nodal Reentrant Tachycardia from Junctional Tachycardia: Novel Application of the Delta H-A Interval

JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 1 2008
KOMANDOOR SRIVATHSAN M.D.
Introduction: Junctional tachycardia (JT) and atrioventricular nodal reentrant tachycardia (AVNRT) can be difficult to differentiate. Yet, the two arrhythmias require distinct diagnostic and therapeutic approaches. We explored the utility of the delta H-A interval as a novel technique to differentiate these two tachycardias. Methods: We included 35 patients undergoing electrophysiology study who had typical AVNRT, 31 of whom also had JT during slow pathway ablation, and four of whom had spontaneous JT during isoproterenol administration. We measured the H-A interval during tachycardia (H-AT) and during ventricular pacing (H-AP) from the basal right ventricle. Interobserver and intraobserver reliability of measurements was assessed. Ventricular pacing was performed at approximately the same rate as tachycardia. The delta H-A interval was calculated as the H-AP minus the H-AT. Results: There was excellent interobserver and intraobserver agreement for measurement of the H-A interval. The average delta H-A interval was ,10 ms during AVNRT and 9 ms during JT (P < 0.00001). For the diagnosis of JT, a delta H-A interval , 0 ms had the sensitivity of 89%, specificity of 83%, positive predictive value of 84%, and negative predictive value of 88%. The delta H-A interval was longer in men than in women with JT, but no gender-based differences were seen with AVNRT. There was no difference in the H-A interval based on age , 60 years. Conclusion: The delta H-A interval is a novel and reproducibly measurable interval that aids the differentiation of JT and AVNRT during electrophysiology studies. [source]


In vitro analysis of the cement mantle of femoral hip implants: Development and validation of a CT-scan based measurement tool

JOURNAL OF ORTHOPAEDIC RESEARCH, Issue 4 2005
Thierry Scheerlinck
Abstract We developed, validated and assessed inter- and intraobserver reliability of a CT-scan based measurement tool to evaluate morphological characteristics of the bone,cement,stem complex of hip implants in cadaver femurs. Two different models were investigated: the stem-cavity model using a double tapered polished femoral-stem that is removed after cement curing and the plastic-replica model using a stereolithographic stem replica that is left in place during CT-scanning. Software was developed to segment and analyze connective CT-images and identify the contours of bone, cement, and stem based on their respective gray values. Volume parameters (whole specimen, cement, stem, air contents of bone and cement), concentricity parameters (distances between centroids of stem and cement, cement and bone, stem and bone), contact surfaces (bone/air and cement/bone) and bone cement mantle thickness parameters were calculated. A three-dimensional protocol was developed to evaluate the minimal mantle thickness out of the CT-plane. The average accuracy for surfaces within CT-images was 7.47 mm2 (1.80%), for bone and cement mantle thickness it was 0.51 mm (9.39%), for distances between centroids it was 0.38 mm (18.5%) and contours: 0.27 mm (2.57%). The intra- and interobserver reliability of air content in bone and cement was sub-optimal (intraclass-correlation coefficient (JCC) as low as 0.54 with an average ICC of 0.85). All other variables were reliable (ICC > 0.81, average ICC: 0.96). This in vitro technique can assess characteristics of cement mantles produced by different cementing techniques, stem types or centralizers. 2005 Orthopaedic Research Society. Published by Elsevier Ltd. All rights reserved. [source]


Variation in identifying neonatal percutaneous central venous line position

JOURNAL OF PAEDIATRICS AND CHILD HEALTH, Issue 9-10 2004
DE Odd
Objective: The study objective was to obtain data on interpretation, including intra and interobserver variation and action taken for a given line tip location, for a series of radiographs demonstrating neonatal long lines. Methods: Nineteen radiographs taken to identify line tip position were digitized and published on an internet site. One film was included twice in order to assess intraobserver variation giving a total of 20 images. Fourteen used radio-opaque contrast and five no contrast. Australian and New Zealand Neonatal Network members and National Women's Hospital NICU staff were invited to participate in the study. For each radiograph, participants were asked to identify if long line tip could be identified, the likely anatomical position and desired action. Interobserver agreement was assessed by the maximum proportion of agreement per radiograph and by the number of different options selected. Intraobserver agreement was assessed by comparing the two reports from the duplicate radiograph. Results: Twenty-seven responses were received. Overall, 50% of the reports stated that the long line tips could be identified. The most commonly reported position was in the right atrium (31%) and most commonly reported action was to pull the line back (53%). The median agreement of whether the line was seen was 68%, agreement on position 62% and agreement on action 86%. On analysis of intraobserver variability, from the identical radiographs, 27% of respondents differed on whether the line tip could be visualized. Conclusion: Interobserver and intraobserver reliability was poor when using radiographs to assess long line tips. The major determinant of line repositioning was the perceived location. [source]


How reliable is contact endoscopy of the nasopharynx in patients with nasopharyngeal cancer?

THE LARYNGOSCOPE, Issue 3 2009
Martin Wai Pak FRCS Ed (ORL)
Abstract Objectives/Hypothesis: To evaluate diagnostic reliability of contact rhinoscopy in patients with nasopharyngeal carcinoma. Study Design: A cross-sectional randomized single-blinded study was carried out to evaluate the reliability of the findings of contact rhinoscopy in patients with nasopharyngeal carcinoma assessed by different observers. Methods: Random images of contact endoscopy of 157 subjects including normal patients and patients with nasopharyngeal carcinoma, both prior to external beam radiation therapy (RT), the non-RT group, and after external beam radiation therapy, the post-RT group, were available for analysis. Three independent observers of varying clinical experience and histopathologic knowledge viewed the images and made a diagnosis for each image. The diagnosis of each image was correlated with the histology of the biopsy from the corresponding patient. Results: In the non-RT group, Kappa values for inter- and intraobserver reliability to differentiate normal epithelium from primary nasopharyngeal carcinoma were 0.894, 1.000, 0.794 and 0.694, 1.000, 0.776 for the house officer, radiologist, and pathologist, respectively. There were no significant differences in interobserver and intraobserver reliabilities between the assessors. In the post-RT group, Kappa values for the inter- and intraobserver reliability to diagnose recurrent carcinoma or atypia, squamous metaplasia, and radiation change for the three observers were 0.820, 0.718, 0.775 and 0.731, 0.622, 0.734, respectively. There were no significant differences in interobserver and intraobserver reliabilities between the assessors. Conclusions: The clinical diagnosis of nasopharyngeal carcinoma by contact endoscopy is highly reliable and is not dependent on the clinical experience or knowledge of histopathology of the observers. Laryngoscope, 119:523,527, 2009 [source]


4331: Anterior segment optical coherence tomography (AS-OCT): a novel diagnostic instrument for conjunctivochalasis

ACTA OPHTHALMOLOGICA, Issue 2010
K GUMUS
Purpose To evaluate cross-sectional conjunctivochalasis area (CChA) and tear meniscus area (TMA) using Fourier-Domain-RTVue-100 optical coherence tomography (OCT) before and after conjunctival cauterization and to evaluate inter- and intraobserver reliability. Methods A total of twelve eyes of 7 patients with conjunctivochalasis aged 56 to 87 were evaluated. After topical anesthesia, conjunctival cauterization was performed on the inferior bulbar conjunctiva. All patients underwent anterior segment OCT (AS-OCT) imaging prior to and 4 weeks after the procedure. Cross-sectional TMA and CChA at 3 locations (nasal, center and temporal areas) were measured in all patients. Results Non-significant increases (p= 0.177) in TMA as a whole (3 locations combined) were observed at following cauterization. CChA measurements significantly decreased in all 3 locations after cauterization (p< 0.001). Mean CChA decreased from 0.247 0.24 mm2 to 0.054 0.79 mm2. For two measurements of TMA by examiner 1, intraclass correlation coefficients (ICC) ranged from 0.998 to 0.999. Among two examiners, Cronbach's alpha reliability coefficients were as high as 0.993 and 0.997 before and after conjunctival cauterization. Regarding the CChA measurements, ICC values were similar to those of TMA, but Cronbach's alpha reliability coefficients were slightly less. Conclusion This study indicates the AS-OCT is a useful and reproducible instrument to measure cross-sectional area of conjunctiva prolapsing into the tear meniscus of patients with conjunctivochalasis. The method can monitor effectiveness of thermo reduction of conjunctivochalasis. [source]