Table 2

Correlations and partial correlations between growth rate, habitat type and global codon usage bias

Growth rate and habitat type

Growth rate and codon usage bias

Habitat type and codon usage bias

r

P

r

P

r

P

Analysis A

Correlation

0.1995

0.0723

0.3451

0.0015

0.4619

1.2538E-5

Partial correlation

0.0482^a

0.6693^a

0.291^b

0.0084^b

0.4274^c

6.919E-5^c

Analysis B

Correlation

0.0368

0.8645

0.2971

0.1586

0.4692

0.0207

Partial correlation

NA

NA

NA

NA

0.4802^c

0.0204^c

Analysis A was based on 82 organisms; analysis B was based on a subset of 24 organisms, which are phylogentically remote from each other. Pearson correlation coefficients were computed. ^aControlling for codon usage bias; ^bcontrolling for habitat type; ^ccontrolling for growth rate. NA, when the Pearson correlation coefficient was not statistically significant, partial correlation was not computed.

Botzman and Margalit Genome Biology 2011 12:R109   doi:10.1186/gb-2011-12-10-r109