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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: New Phytol. 2011 Dec 12;193(3):797–805. doi: 10.1111/j.1469-8137.2011.03988.x

Table 2.

Results of the logistic multiple regression analyzing the variation across 57 Brachypodium distachyon populations of the probability of polyploidy (the probability of finding a tetraploid cytotype in any population, estimated from the frequency of polyploids/100) as a function of PC1 (which is inversely related to aridity), PC2 (a geographic factor) and their interaction

Source β ± 1SE df χ2 P
PC1 −0.82 ± 0.31 1,56 10.13 0.0015
PC2 −0.76 ± 0.34 1,56 8.74 0.0031
PC1 × PC2 −0.1 ± 0.35 1,56 2.21 0.137

Significant values (P < 0.05) are in bold.