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Table 2 Mean (SE) for brain mass, SD in brain mass and skewness in brain mass for matched rural and urban populations of 71 species of birds

From: Brain size and urbanization in birds

Variable

Rural mean

Rural SE

Urban mean

Urban SE

t

p

Effect size

Mean

1.799

1.119

0.807

1.118

0.858

0.39

0.103

SD

0.176

1.109

0.185

1.108

0.697

0.49

0.084

Skewness

0.157

0.110

-0.288

0.104

-2.756

0.0075

0.315

  1. The t-test is a paired t-test for the difference between rural and urban populations. The models were weighted by sample size. Effect size was estimated as Pearson’s product-moment correlation coefficient.