Fig. 2

Influence of urban soil studies variables on scientific interest (CrossRef citations, panel A) and web popularity (Altmetric Attention Score, panel B). Forest plots summarise the variable effects based on Gaussian linear mixed models (GLMMs). Positive residuals indicate higher effect of the variable compared with its baseline level (see Table S1). Colours indicate different categories of the independent variables. Error bars show 95% confidence intervals while asterisks (*) the significance of the effects (α = 0.05). Estimated regression parameters are provided in Table S2; see also Figure S3 and Figure S4 for model validation parameters