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. 2013 Jun 27;5(1):16. doi: 10.1186/1866-1955-5-16

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Copyright © 2013 Barttfeld et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Topology of networks obtained from delta band SL_f,pmatrices. (a) Small-world indices, after a median-split of subjects into high and low SRS groups. Low SRS subjects have a higher small-world index (low SRS group = 0.38, high SRS group = 0.22; T-value = 4.17; P = 0.0001; see Additional file 4: Table S3 for the size effect of all frequency bands). (b) ROC curve for the discrimination between low and high SRS score based on the small-world index. A_ROC is highly significant (A_ROC = 0.74, P < 0.001). (c) Regression between small-world index and SRS score (and age and gender), showing the negative relation between small-world index and SRS score (β-value = -0.08; P = 0.008, R-square = 0.09).