Results of Kruskal–Wallis one-way analysis of variance.

χ2 = value of H statistic for the adopted significance level; Df = degree of freedom; p = significance level (p≤0.05). Bold values indicate significance. The table is divided between the Western Palearctic and the Northwestern European subregion and shows the results of variance analyses between means of MIS's for several temperature, humidity and vegetation categories and is based on the proportions of fossil bird species assigned to each category. Temperature categories are based on a gradient going from the coldest (Temperature A) to the warmest (Temperature E) conditions and humidity follows a similar gradient going from the driest (Humidity A) to the wettest (Humidity E) conditions.