Table 3

Mann–Whitney test between genes that do not show signals of positive selection (Group 1, 40 genes) and genes that show signatures of positive selection (Group 2, 17 genes), for each of the node centrality measured
Rank Sum (Group 1) Rank Sum (Group 2) U Z p-level
Betweenness 1151.00 502.00 331.00 −0.16 0.8749
Centroid 1201.50 451.50 298.50 0.73 0.4674
Closeness 1173.50 479.50 326.50 0.24 0.8135
Eccentricity 1157.00 496.00 337.00 −0.05 0.9578
Node.degree 1183.50 469.50 316.50 0.42 0.6758

A p-value < 0.05 for a centrality measure would indicate that genes belonging to the two groups have different values for that centrality measure.

Dall’Olio et al.

Dall’Olio et al. BMC Evolutionary Biology 2012 12:98   doi:10.1186/1471-2148-12-98

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