Exact(8)
A concordance coefficient with value of 1 indicates a perfect agreement, −1 indicates a perfect disagreement, and 0 indicates no agreement.
The k statistics for multiple observers and the standard errors for were calculated by using the method reported by Fleiss [23] [25]: k values range between +1 (perfect agreement) and −1 (perfect disagreement); values greater than 0.75 represent an excellent agreement; values lower than 0.40 a poor agreement; and values between 0.40 and 0.75 a fair to good agreement beyond chance.
This index attains consensus values between 0 (perfect disagreement) and 1 (perfect agreement).
A value of 1 indicates perfect agreement, −1 perfect disagreement, and 0 an agreement that is no better than chance.
The statistic by definition is bounded between -1 and 1, where -1 means perfect disagreement while 1 means perfect agreement.
Computed ICC values range from -1 (perfect disagreement) to +1, which occurs when assessments are in perfect agreement[ 11, 12].
This mathematical measure represents the degree of agreement or disagreement, in which the values are between 0 (perfect disagreement) and 1 (perfect agreement).
A value of Kappa equal to +1 implies perfect agreement between the two raters, while that of -1 implies perfect disagreement.
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