This is crying out for a funnel plot: https://www.theguardian.com/commentisfree/2011/oct/28/bad-science-diy-data-analysis https://www.theguardian.com/commentisf

This is crying out for a funnel plot: https://www.theguardian.com/commentisfree/2011/oct/28/bad-science-diy-data-analysis https://www.theguardian.com/commentisfree/2011/oct/28/bad-sc...