Measurement observer variation. Medical search. Frequent questions

The coefficient of repeatability average measurements of FAZ area were 0.015 mm 2 and 0.013 mm 2 for the first and second observers, respectively. (bmj.com)
The intraclass correlation coefficient values were 0.997 (95% CI 0.995 to 0.998) and 0.998 (95% CI 0.996 to 0.999) for the first and second observers, respectively. (bmj.com)
The coefficient of variation (CV) was used to assess intraairway, intraobserver and interobserver variability. (ox.ac.uk)
Purpose: To determine whether objective volumetric whole-lesion apparent diffusion coefficient (ADC) distribution analysis improves upon the capabilities of conventional subjective small region-of-interest (ROI) ADC measurements for prediction of renal cell carcinoma (RCC) subtype. (johnshopkins.edu)

We studied 47 patients to investigate the accuracy of coronary plaque volume measurement acquired with 64-slice multi-slice computed tomography (MSCT), using newly developed quantification software, when compared with quantitative intracoronary ultrasound (QCU). (escardio.org)
Ultrasound measurement of the optic nerve sheath diameter (ONSD) has been shown to correlate with intracranial pressure (ICP). (medscimonit.com)
To assess the reproducibility of, and determine normative data for, flow volume measurements from the right common carotid artery (CCA) and its relation to left ventricular output (LVO) in stable term and preterm babies using Doppler ultrasound. (bmj.com)
7 We have assessed the validity of volumetric measurements using a near focus transducer on a Doppler ultrasound phantom and determined the intraobserver and interobserver reproducibility of right common carotid artery (CCA) flow in newborn infants. (bmj.com)
To exclude possible reading errors, the intrarater reliability of the ultrasound perfusion measurement method was estimated. (medscimonit.com)
It is noted that there could be >5% variation in kidney ultrasound measurements obtained in the same child by different observers though this will not account for a significant difference in both the kidney sizes in the same child. (ndtv.com)

At the same time, it appears that when applied to two urban sites where habituation to humans might have occurred, it is infrastructural networks rather than human presence per se that played a greater role in tit reproductive trait variation. (frontiersin.org)

We also aimed to assess if there was a relation between right CCA flow, left ventricular output (LVO), and traditionally assessed Doppler measurements of anterior cerebral artery blood flow velocity (ACABFV). (bmj.com)
The component of the star velocity in the observer's direction is visible in spectroscopic measurements thanks to Doppler effect. (sp-astronomia.pt)
This prospective study aimed to test the association between renal cortical perfusion (RCP) estimated in color Doppler sonographic dynamic tissue perfusion measurement (DTPM) with thyroid hormones in 36 patients treated with levothyroxine following total thyroidectomy for resectable thyroid cancer. (medscimonit.com)
This small prospective study from a single center showed that the renal cortex's color Doppler sonographic dynamic tissue perfusion measurement had very good intraobserver reproducibility. (medscimonit.com)

Anthropometric measurements and a general questionnaire incorporating questions related to socio-demographic and lifestyle characteristics, education level and physical activity were used. (isciii.es)
Anthropometric measurements such as skinfolds and circumferences and bioelectrical impedance (a method used to estimate the amount of lean tissue) will allow cross-sectional analysis of the relationship between obesity and risk of disease. (cdc.gov)

Reproducibility for the measurements of regional plaque burden with QMSCT-CA was good, with a mean intraobserver and interobserver variability of 0% ± 16% and 4% ± 24%, respectively. (escardio.org)
Moreover, wide variation between individual measurements was reported, indicating high observer variability (1;2). (escardio.org)
Intra-and inter-observer variability and the internal consistency of the scale were assessed. (who.int)

Conclusion: The objective methodology of whole-lesion volumetric ADC measurements maintains the sensitivity/specificity of conventional expert-based ROI analysis, provides information on lesion heterogeneity, and reduces observer bias. (johnshopkins.edu)

Combining this with Troy's similar finding that redpolls form a continuum from pale to dark, and Troy's data showing that intermediate-colored birds were also intermediate in skeletal measurements, implies that observers should expect to find lots of intermediate birds that cannot be confidently assigned to a species. (sibleyguides.com)

Intra-observer variances were 0.001 +/- 0.001 mm2 for cup area (mean +/- SD), 0.002 +/- 0.002 mm2 for disc area and 0.002 +/- 0.003 mm2 for rim area. (nih.gov)
These values for intra-observer variance were comparable with the results obtained using manual planimetric techniques. (nih.gov)
Intra-observer variance for disc area was significantly larger for the less trained of the two experienced observers. (nih.gov)
This study looked at intra-observer and inter-observer reliability among three emergency physicians (EPs) using three different imaging protocols. (medscimonit.com)

The aim of this study was to determine the intra- and inter-observer variation in the use of a system designed for exact measurements from standard optic nerve head photographs. (nih.gov)
Inter-observer variances were 0.004 +/- 0.009 mm2 for cup area, 0.008 +/- 0.013 mm2 for disc area and 0.009 +/- 0.014 mm2 for rim area. (nih.gov)
These inter-observer variances were significantly larger than those previously reported for manual planimetry. (nih.gov)
These data suggest comparable precision and inter-observer reliability can be achieved. (medscimonit.com)
On the other one, manual stenosis measurements require a manual tracing of vessel borders, which is a time-consuming task and might suffer from inter-observer variations. (uab.es)
Inter-observer agreement (Kappa statistic, 95% confidence interval (CI)) for categorization of carotid stenosis, as 0-29%, 30-69% or 70-99% was good (0.68, 0.63-0.73) on 789 conventional or digitally subtracted selective angiograms, and good (0.64, 0.54-0.75) on 174 conventionally and digitally subtracted aortic arch injection angiograms, but was poor (0.29, 0.02-0.80) on 29 intravenous digital subtraction angiograms. (ox.ac.uk)
Inter-observer agreement did not vary with the method of image acquisition of arterial angiograms, but was dependent on the quality of visualization of the stenosis: kappa = 0.73 (0.67-0.79) for good quality angiograms vs. 0.54 (0.44-0.64) for poor quality angiograms. (ox.ac.uk)
Inter-observer agreement for assessment of plaque surface morphology was moderate (kappa 0.4-0.6) and did not vary with type of angiography or method of image acquisition. (ox.ac.uk)

The absolute differences between the two observers ranged from -0.35 to +0.20 mm2 (-0.08 +/- 0.11 mm2) for cup area, from -0.38 to +0.15 mm2 (-0.08 +/- 0.11 mm2) for disc area and from -0.29 to +0.34 mm2 (-0.06 +/- 0.12 mm2) for rim area. (nih.gov)
The coronal imaging technique demonstrated less inter-rater variance and may be a better technique when such small measurement differences are important. (medscimonit.com)
Individual differences in cognitive planning on the Tower of Hanoi task: neuropsychological maturity or measurement error? (ox.ac.uk)

OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: The primary endpoint was patient preference between the two drugs, as assessed by a preference questionnaire (p value calculated with the Prescott test). (bvsalud.org)

It is a version of Claude Shannon 's communications diagram, where Shannon's labels are supplemented by the analogous steps in a physical measurement. (informationphilosopher.com)
To clarify ideas, we may think that observers in the "OS" (="SO") play a role similar to an observer in an inertial frame [5] as opposed to observers located in the "LS" that would play an analogous role to observers in a non-inertial referential. (scirp.org)

Within subjects, the coefficients of variations were 1.83% (95% CI 1.51% to 2.20%) and 1.86% (95% CI 1.33% to 2.43%) for the first and second observers, respectively. (bmj.com)
A state observer was constructed to track and predict the thermal induced errors and continuously modify the coefficients of the error model. (purdue.edu)

CT utilizes specific airway and lung density measurements to identify severity of disease and pathology, hyperpolarized gases are used as MRI contrast media to identify small airway disease, and positron emission tomography (PET) can help identify and target lung inflammation. (medscape.com)

Methods Sixty healthy volunteers (60 eyes) were subjected to FAZ area measurements by means of high speed and high resolution spectral-domain OCT (SD-OCT) XR Avanti with the split-spectrum amplitude decorrelation angiography algorithm by two experienced examiners in two different sessions. (bmj.com)
Methods: The authors present two measurements in single-rooted teeth: the peridontosis and transparency of the root. (bvsalud.org)

Results: The accessibility measures indicated considerable variation in correlation, Kappa and spatial pattern. (cdc.gov)

Several cross-sectional studies find associations between blunted circadian BP variation and cardiovascular complications ( 2 - 4 ). (diabetesjournals.org)

Masked measurements were made 3 times by 2 observers, from stereophotographs of the optic nerve head of 56 eyes from 30 glaucoma suspects. (nih.gov)

Let's call of "Local Observer" (="LO") the observer who belongs to a "LS" and therefore subject―him and his instruments―the spatial contraction. (scirp.org)
Let's call of "Sidereal Observer" (="SO") those observers located in this spatial region. (scirp.org)

Nutritionists consider BMI (weight/(height)2) as the international standard because it has been shown to have an acceptable, but not perfect, correlation with hydrostatic and skin-fold measurements, and to correlate with mortality risk. (cdc.gov)

0.001) with QMSCT-CA. Overall, the limits of agreement for plaque burden/volume measurement between QCU and QMSCT-CA were relatively large. (escardio.org)
In this study, we wanted to establish normal values of flow volume measurement from the right CCA in stable preterm and term infants. (bmj.com)

The bias of a measurement is the total systematic error associated with that measurement. (oxfordreference.com)
The Body Mass Index (BMI) is used as an indicator of adiposity because it is simple, requires no technical equipment or special training, and is generally not affected by observer bias. (cdc.gov)

Jay Respler, a dedicated satellite observer who has logged hundreds of brightness reports on Starlinks and OneWeb payloads since the first launches. (thespacereview.com)
Next, suitable comparison stars are chosen to provide brightness measurements. (thespacereview.com)

The main secondary objectives included reasons for patient preference, response at week 12, tolerance of each drug, and measurement compared with baseline of cognitive outcomes assessed using tablet questionnaires. (bvsalud.org)

Taking multiple measurements (3 is ideal) with the mean measurement being plotted on a standardized growth chart (This helps to decrease observer variation. (medscape.com)
If, for example, we have a measuring instrument as a scaler with the length "L" (=1 meter), then, from the point of view of an observer who does not suffer gravitational influence, it will notice that this scaler, with the time, will decrease in size. (scirp.org)

In the radial velocity time series, one searches for periodic variations due to planets. (sp-astronomia.pt)
At a minimum, the location, expected time of observation, and the limiting magnitude an experienced observer can reliably see must be known, bearing in mind that moving objects may appear dimmer visually. (thespacereview.com)
Since we know there were 1,000 total containers, 10% of 1,000 gives us our answer of 100 again-but this time with 90% fewer measurements. (mlo-online.com)
This was during a time when observers were looking for a Ranger crash plume. (aber.ac.uk)
We have shown that the machine cannot determine its future for all time within the accuracy permitted by the measurements it can perform, and that the impossibility of its doing so is equivalent to the second law of thermodynamics. (informationphilosopher.com)
Of course, for observers subject to these there will be no change, since all space and everything that is immersed in it is contracting at the same time so that it will have no change in the measurements made by them. (scirp.org)
In this long period of time, which may be billions of years from the emission of the photon until it reaches our planet, our space―and our scalers―will be reduced in size compared to the original size they had when this photon was emitted under the view of an observer who is not subject to such a gravitational field. (scirp.org)

The measurement was made by one observer blinded to other data. (diabetesjournals.org)
The original method advocates the measurements to be made on the labial surface of the root, which was honored in this study. (bvsalud.org)
In such cases, measurements were made on the most labial part of the mesial surface. (bvsalud.org)

Despite their apparent utility, these techniques are still not widely used by control programs in part because health personnel often consider satellite data difficult to interpret (previous studies have usually used reflectance measurements from satellite sensors or with land-cover classifications "custom-built" by the investigators). (cdc.gov)
The role of diabetic autonomic neuropathy in both QT dispersion and circadian BP variation has been proposed, but data have been conflicting. (diabetesjournals.org)
Actual stature, weight, and body measurements including skinfolds, girths, and breadths will be collected in the MEC for purposes of assessing growth, body fat distribution, and for provision of reference data. (cdc.gov)
In a U.S. Forest Service study during the 2009-2012 fire seasons, WLFs from 57 different fires across the U.S. were monitored for CO using CO data-logging detectors while an observer recorded worker tasks, fire characteristics, and environmental conditions at scheduled intervals. (cdc.gov)

In clinical practice, an essential component of pediatric preventative care is the accurate measurement of growth in this population. (medscape.com)
The measurements of growth in pediatrics must be as accurate as possible. (medscape.com)
Accurate measurements of growth, and plotting these measurements on the appropriate growth chart for a child's age and gender is an essential part of the pediatric physical examination. (medscape.com)
The room is equipped with some unique features designed to facilitate an accurate and efficient measurement procedure. (cdc.gov)

It was found that the subjective judgment of colors can vary somewhat between observers, but the variation is usually in the shade of green. (ametsoc.org)

The CCD measurements in B and V are pretty constant in the same interval. (aavso.org)

Although as an alternative solution auxiliary observers are generally adopted to relieve the burden of high-precision modelling [ 9 , 14 , 15 ], it increases the system complexity and can still not cover all the possible model uncertainties and external disturbances. (hindawi.com)

This near-complete absence of age-related variation differs from what Knox (1988) reported - that in European redpolls immatures are darker than adults. (sibleyguides.com)

Procedure -TDI was performed by the same trained observer (VC) on all cats. (avma.org)

The effect of angiographic technique and image quality on the reproducibility of measurement of carotid stenosis and assessment of plaque surface morphology. (ox.ac.uk)
We studied the reproducibility of measurement of carotid stenosis and assessment of plaque surface morphology on 1001 angiograms from a consecutive series of patients entered into the European Carotid Surgery Trial. (ox.ac.uk)
We conclude that the reproducibility of measurement of carotid stenosis and the assessment of plaque surface morphology vary depending on the type of angiography and the quality of visualization of the stenosis. (ox.ac.uk)

Conclusions FAZ area measurements by means of OCT-A showed excellent reproducibility and repeatability in healthy eyes. (bmj.com)

The growth charts currently used in Norway, are based on measurements from the 1970s and 80s. (tidsskriftet.no)
To control for variations between population groups, it has been common to develop growth charts specific to ethnic groups and nations. (tidsskriftet.no)
Those members of the office staff who are responsible for growth measurements should be trained in these skills in order to keep errors to a minimum. (medscape.com)
Growth is a fluid rather than a static measurement. (medscape.com)

The question of age variation has come up repeatedly in redpoll discussions, so I finally tried to find an answer to the question of just how important age-related variation in plumage might be. (sibleyguides.com)
To determine what part of the flash comes from the lunar rock heated at impact or from volatiles released by the probe, it is important to have measurements in several optical and infrared bands, in addition to the CFHT observations at 2.12 microns. (esa.int)

Body weight variation from morning to evening is generally negligible. (medscape.com)
Anthropometry is the study of the measurement of the human body in terms of the dimensions of bone, muscle, and adipose (fat) tissue. (cdc.gov)
The body measurement room is located in trailer #4 of the MEC. (cdc.gov)
The body measurement room is shared with the allergy component and the MEC computer. (cdc.gov)
Lastly a table describing body composition measurements, their application in the workplace, and their outcome value for workplace wellness programs is presented. (cdc.gov)
By studying different populations it is possible to generate different "P" values that better reflect the variations in racial/ethnic body-fat distribution, body-segment length, height, weight, gender, and age groups - including occupational groups. (cdc.gov)

Repeated measurements show that the observer is only a small component of variation in rank values. (newzealandecology.org)

Among the many variations that have evolved over the past decade, there is now "outcome-based budgeting" (which is used in Oregon and Michigan ) and "results-based budgeting" (which is used in North Carolina ). (businessofgovernment.org)

ABSTRACT This study aimed to update and re-validate the scoring system of Fahmy and El-Sherbini for measurement of socioeconomic status in health research in Egypt. (who.int)
In modelling, many efforts have been centred on diverse kinds of system descriptions and auxiliary observers [ 8 - 12 ]. (hindawi.com)

Note that measurement errors associated with child variation can exist. (medscape.com)
For example, a mean height variation of approximately 1.5 cm can exist between a measurement taken in a child upon wakening and then again in the late afternoon. (medscape.com)

Reproducibility studies were performed on 30 newborn infants by two observers. (bmj.com)

It consists in the analysis of two dental variables (periodontosis and transparency) and three height measurements (periodontosis, transparency and root),applying the numbers to the following formula: A (age) = (P x 0.18) + (T x 0.42) + 25.53. (bvsalud.org)

A version of the problem of free will appropriate to a well-informed heat engine is that of determining whether the engine can predict its own future on the basis of measurements it can perform, where knowledge of the dynamical laws governing the engine and its environment is stored in the memory. (informationphilosopher.com)

Berry A (1974) The use of non-metrical variations of the cranium in the study of Scandinavian population movements. (revuesonline.com)

The search algorithms utilize computer simulation with limited information abstracted from previous measurements. (purdue.edu)
We call for observers to search for the crater and ejecta blankets from SMART-1, in particular using visible or infrared imagery, or even to look at spectroscopic anomalies at the impact site. (esa.int)

Most observers of-and experts on-public budgeting do agree that, generally speaking, PBB is the allocation of funds to achieve program-matic goals and objectives as well as some indication or measurement of work, efficiency, and/or effectiveness. (businessofgovernment.org)

Also, the visual observers seem to be split, with half seeing the same brightening trend as I do, and the other half constant, similar to the CCD. (aavso.org)

Individual variation within an age band was substantial. (ox.ac.uk)

Diseases2

Analytical, Diagnostic and Therapeutic Techniques and Equipment7

Phenomena and Processes1

Health Care3

Coefficient4

Ultrasound6

Humans1

Doppler4

Anthropometric2

Variability3

Volumetric1

Skeletal1

Intra-observer4

Inter-observer8

Differences3

Statistical analysis1

Analogous2

Coefficients2

Airway1

Methods2

Kappa1

Complications1

Optic1

Spatial2

Correlation1

Volume measurement2

Bias2

Brightness2

Baseline1

Decrease2

Time7

Made3

Data4

Accurate4

Subjective1

Interval1

Burden1

Absence1

Procedure1

Assessment3

Conclusions1

Growth4

Important2

Body6

Values1

Results1

System2

Child2

Studies1

Height1

Predict1

Population1

Search2

Generally1

Similar1

Individual1