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The determination of power quality disturbances has been studied in the last twenty years from different perspectives. Current decomposition provides a suitable approach to determine how disturbances propagate among circuits. The application of Fryze-Buchholz-Depenbrock - FBD power theory revealed useful results, such application has been called Method of Disturbances Interaction. In this paper a statistical analysis of the indices is presented, showing that indices' statistical behavior provides additional information on the propagation and origin of disturbances. The Method and the statistical analysis is illustrated in a practical application, a discussion and conclusions are listed as well.