ArticleBMC medical research methodology2021
Concordance rate of a four-quadrant plot for repeated measurements.
Article in BMC medical research methodology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Microwave Radar Sensing for Non-Invasive Intra-Abdominal Pressure Monitoring: A Simulation-Based Analysis with Phantom Testing.Sensors (Basel, Switzerland) · 2026Article
- Pulmonary pulsatility quantified by electrical impedance tomography in severe acute respiratory distress syndrome patients undergoing extracorporeal membrane oxygenation support.Annals of intensive care · 2026Article
- Cerebral oxygen extraction and blood flow in community-based older adults: associations with white matter hyperintensity and neurocognitive function.Brain communications · 2026Article
- Continuous measurement of pulse arrival time for identification of blood pressure changes in patients undergoing hemodialysis-a feasibility study.Clinical kidney journal · 2025Article
- Variation and accuracy of intra-abdominal pressure measurement in different body positions: a prospective study.World journal of emergency surgery : WJES · 2025Article
- Multivariate Adjustments for Average Equivalence Testing.Statistics in medicine · 2025Article
- Comprehensive performance evaluation of a high-throughput automated system for pathogen nucleic acid detection in clinical settings.Frontiers in microbiology · 2025Article
- On the assessment of the ability of measurements, nowcasts, and forecasts to track changes.BMC medical research methodology · 2024Article
- An Introduction to Ventra: A Programmable Abdominal Phantom for Training, Educational, Research, and Development Purposes.Sensors (Basel, Switzerland) · 2024Article
- In Vitro Validation of a Novel Continuous Intra-Abdominal Pressure Measurement System (TraumaGuard).Journal of clinical medicine · 2023Article
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Authors and funding
3 authors.
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No grant is acknowledged in the PubMed record.
Abstract
backgroundTo assure the equivalence between new clinical measurement methods and the standard methods, the four-quadrant plot and the plot's concordance rate is used in clinical practice, along with Bland-Altman analysis. The conventional concordance rate does not consider the correlation among the data on individual subjects, which may affect its proper evaluation.
methodsWe propose a new concordance rate for the four-quadrant plot based on multivariate normal distribution to take into account the covariance within each individual subject. The proposed concordance rate is formulated as the conditional probability of the agreement. It contains a parameter to set the minimum concordant number between two measurement methods, which is regarded as agreement. This parameter allows flexibility in the interpretation of the results.
resultsThrough numerical simulations, the AUC value of the proposed method was 0.967, while that of the conventional concordance rate was 0.938. In the application to a real example, the AUC value of the proposed method was 0.999 and that of the conventional concordance rate was 0.964.
conclusionFrom the results of numerical simulations and a real example, the proposed concordance rate showed better accuracy and higher diagnosability than the conventional approaches.
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