Figure 2From: New perspectives on evolutionary medicine: the relevance of microevolution for human health and disease Frequencies of individuals with median arteries of forearms by date of birth in a sample of 284 South African dissection cadavers. Trend of increase in the incidence is significant (χ2 (1) = 11.90, P <0.001 z = 3.94, P <0.0011 (z test for linear trends in proportions)). For further data see [71].Back to article page