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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.