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Related Concept Videos

Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
Random and Systematic Errors01:20

Random and Systematic Errors

Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
The Thoracic Cage: Ribs01:20

The Thoracic Cage: Ribs

Ribs are curved, flattened bones forming the thoracic cavity wall with the thoracic muscles. There are 12 pairs of thoracic ribs. The posterior ends of all the ribs articulate with the T1–T12 thoracic vertebrae. In contrast,the anterior ends of most ribs attach to the sternum via their costal cartilages.
Parts of a Typical Rib
A typical rib has a head, neck, and body. The posterior end of the rib is called the head, followed by a narrow neck. The head articulates primarily with the costal facet...
Statistical Analysis: Overview01:11

Statistical Analysis: Overview

When we take repeated measurements on the same or replicated samples, we will observe inconsistencies in the magnitude. These inconsistencies are called errors. To categorize and characterize these results and their errors, the researcher can use statistical analysis to determine the quality of the measurements and/or suitability of the methods.
One of the most commonly used statistical quantifiers is the mean, which is the ratio between the sum of the numerical values of all results and the...
Adjusting a Traverse01:12

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...

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Related Experiment Video

Updated: Jul 12, 2026

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
10:07

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Published on: February 10, 2015

Measurement of rib vertebral angle difference. Intraobserver error and interobserver variation

R J McAlindon1, R W Kruse

  • 1Department of Orthopaedics, Alfred I. duPont Institute, Wilmington, Delaware, USA.

Spine
|January 15, 1997
PubMed
Summary

The rib vertebral angle difference measurement in juvenile scoliosis is reliable. Interobserver and intraobserver errors were low, indicating consistent and valid results for this common diagnostic tool.

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Last Updated: Jul 12, 2026

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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Area of Science:

  • Orthopedics
  • Radiology
  • Pediatric Spine Deformities

Background:

  • The rib vertebral angle difference (RVAD) is frequently used in juvenile scoliosis assessment.
  • Previous studies have not rigorously evaluated the reliability of the RVAD measurement.
  • Ensuring measurement accuracy is crucial for effective scoliosis management.

Purpose of the Study:

  • To quantify the interobserver and intraobserver error in measuring the rib vertebral angle difference.
  • To assess the reproducibility of the RVAD measurement in juvenile scoliosis.

Main Methods:

  • Fifty standing radiographs of juvenile scoliosis patients (Risser 0) were analyzed.
  • Measurements were performed by three independent observers on three separate occasions using Mehta's method.
  • Standardized techniques and equipment were employed to minimize confounding variables.

Main Results:

  • The intraobserver error for RVAD measurement was found to be 4.4 degrees.
  • The interobserver error was determined to be 3.6 degrees.
  • Interobserver accuracy was recorded at 6.2 degrees.

Conclusions:

  • The rib vertebral angle difference measurement demonstrates high reproducibility.
  • The RVAD is a valid and reliable measurement tool for juvenile scoliosis.
  • Consistent results support its continued use in clinical practice.