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Table 3 Regression analyses

From: Phylogeny and adaptive evolution of the brain-development gene microcephalin (MCPH1) in cetaceans

A)

      

Analysis

n

R2

t-statistic

p-value

(1 tailed positive)

All Cetaceans

      

ω vs. brain mass

27

0.100

1.663

0.054

ω vs. EQ

27

0.105

-1.710

1.000

ω vs. body mass

27

0.148

2.087

0.024

ω vs. max body mass

27

0.112

1.776

0.044

Toothed Whales only

      

ω vs. brain mass

25

0.064

1.249

0.112

ω vs. EQ

25

0.031

-0.860

1.000

ω vs. body mass

25

0.079

1.408

0.086

ω vs. max body mass

25

0.084

1.454

0.079

B)

  

dN

dS

Analysis

n

R 2

t-statistic

p-value

(1 tailed positive)

t-statistic

p-value

(1 tailed negative)

All Cetaceans

      

Body mass vs. dN &dS

27

0.231

0.803

0.215

-2.498

0.010

Brain mass vs. dN &dS

27

0.173

0.521

0.304

-2.022

0.027

  1. A) Regression analyses using BayesTraits of root-to-tip ω (dN/dS) versus absolute brain mass, relative brain mass (encephalization quotient = EQ), absolute body mass, and maximum body mass derived from [45]. Results are shown for all cetaceans and toothed whales only. B) Multiple regression analyses of absolute brain mass and absolute body mass versus dN (rate of nonsynonymous substitution) and dS (rate of synonymous substitution).