Classification of the coefficients of variation of parameters evaluated in Japanese quail experiments

Leal, Dhv; Filho, DE de Faria; Oliveira, E.L.

doi:10.1590/1516-635x160297-100

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…However, cage density (137.5cm 2 bird −1 ) combined with temperature did not affect performance. Coefficients of variation were below values reported by Leal et al (2014).…”

Section: Resultscontrasting

confidence: 56%

Laying Performance and Egg Quality of Japanese Quails Fed Diets Containing Castor Meal and Enzyme Complex

Ludke

Pimentel

Ludke

et al. 2018

Braz. J. Poult. Sci.

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“…However, cage density (137.5cm 2 bird −1 ) combined with temperature did not affect performance. Coefficients of variation were below values reported by Leal et al (2014).…”

Section: Resultscontrasting

confidence: 56%

Laying Performance and Egg Quality of Japanese Quails Fed Diets Containing Castor Meal and Enzyme Complex

Ludke

Pimentel

Ludke

et al. 2018

Braz. J. Poult. Sci.

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“…The CV is obtained by calculating the standard deviation as a percentage of the group mean; a CV of < 10% is classified as low, 10%–20% is classified as medium, 21%–30% is classified as high, and > 30% is classified as very high. 20) Cohen's d , which is the difference between two means divided by the standard deviation, was used to estimate effect sizes; a Cohen's d of ≥ 0.2 is considered small, ≥ 0.5 is considered medium, and ≥ 0.8 is considered large. 21) …”

Section: Methodsmentioning

confidence: 99%

Morphometric Variations in the Volar Aspect of the Distal Radius

Kwon

Lee

et al. 2018

Clin Orthop Surg

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BackgroundSignificant discrepancy exists between anatomical plate designs and the anatomy of the native distal radius, which may be attributable to considerable morphometric variations in the volar aspect of the distal radius. We aimed to evaluate the degree of variability in the morphometry of the distal radius and identify factors associated with this variability.MethodsWe measured the volar surface angle (VSA) of the intermediate and lateral columns and the volar surface width (VSW) in the distal radius from three-dimensional computed tomography scans acquired from 81 cadaveric forearms. These morphometric parameters were compared between the lateral and intermediate columns, between males and females, and between Koreans and Caucasians. Caucasian morphometric data were obtained and pooled from the previous studies. The coefficient of variation was used to assess the variability of the parameters and Cohen's d to estimate the effect size of the difference between groups.ResultsThe average VSA of the lateral column was 22° ± 6°, and that of the intermediate column was 29° ± 8° in Koreans (p < 0.001). The variability was high for both VSAs. The VSA of the intermediate column was significantly larger in males than in females (p < 0.001) and in Caucasians than in Koreans (p < 0.001). The average VSW of distal radius was 30 ± 3 mm at the watershed line, and it became narrower proximally. The VSW was significantly larger in males than in females (p < 0.001) and in Koreans than in Caucasians (p < 0.001). The effect sizes of the difference for the VSA and VSW between sexes, races and columns were medium to large.ConclusionsConsiderable variability exists in the morphometry of the volar distal radius, with sex, race, and column as contributing factors. These results suggest that surgeons should carefully choose an anatomical volar locking plate with appropriate angulation characteristics for each patient to achieve patient-specific alignment of the distal radius.

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“…The variables: egg production, egg mass, feed conversion ratio per egg mass, feed conversion ratio per dozen eggs, in the very high classification, present CV higher than 10% in all six classification methods ( Table 7). The same occurred in the essay by Leal et al (2014) This indicates that the most important would be to verify the outliers and to remove them than necessarily verify the normality.…”

Section: Resultsmentioning

confidence: 75%

Methods for classifying coefficients of variation in experimentation with poultrys

et al. 2019

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The aim of this work was to evaluate the coefficient of variation (CV) and to establish classification ranges for the main variables evaluated in experimentation with poultrys through different methods. The CV data of different response variables observed in poultry articles (broilers, laying hens, roosters and quails) published in five national journals were tabulated in a Microsoft Excel 2010® worksheet. Afterwards, they were subjected to normality evaluation through the Shapiro-Wilk method, and later the following data of the descriptive statistics were utilized: maximum value, minimum value, range, mean, median, standard deviation, midquartile, first quartile, third quartile, interquartile range, and pseudo sigma. According to the values obtained in the descriptive statistics of the CVs of each variable, classification ranges were elaborated for these values, considering six different forms of classification, adapted from the consulted literature. The results indicated that the classification ranges established for CVs in experiments with poultrys are different from those recommended in statistical textbooks. It is possible to utilize midquartile, pseudo sigma, mean and standard deviation through different methods in order to classify the CVs, but the use of the standard deviation promotes incoherent classifications in certain variables, and promotes increase in the amplitude between the lowest and the highest CV value obtained for the classification ranges.

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Classification of the coefficients of variation of parameters evaluated in Japanese quail experiments

Cited by 5 publications

References 27 publications

Laying Performance and Egg Quality of Japanese Quails Fed Diets Containing Castor Meal and Enzyme Complex

Laying Performance and Egg Quality of Japanese Quails Fed Diets Containing Castor Meal and Enzyme Complex

Morphometric Variations in the Volar Aspect of the Distal Radius

Methods for classifying coefficients of variation in experimentation with poultrys

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