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Bispectral index and state entropy of the electroencephalogram during propofol anaesthesia
*E-mail: micheleiannuzzi@libero.it
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EditorWe read with interest the study by Bonhomme and colleagues,1 in which some interesting differences from our published data2 have emerged. We agree that BlandAltman analysis appears to be the right statistical test to perform in an attempt to determine the degree of agreement between two measurement techniques. The only two studies that used the BlandAltman analysis to compare BIS and SE have been published by Bonhomme and our group. We found a good comparability (mean difference 0.1) between the two (the upper and lower limits of agreement were 19.9 and 19.6). Bonhomme used the same type of analysis on data pairs averaged over 1 min over the entire period and reported a mean difference of 2.5 and similar upper and lower limits of agreement (19.5 and 24.6). We agree that this may be
Naples, Italy
Liege, Belgium
*E-mail: vincent.bonhomme@chu.ulg.ac.be
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