Fig. 4.

Relative importance of each covariate category in saturated OLS regression models predicting R0 within all global cities, global cities excluding China, and cities within China only. Y axis denotes collective proportion of variance explained, i.e., contribution to model R². See SM Table S2 for explanation of covariate categories. No socioeconomic covariates and a limited subset of demographic covariates were modelled due to lack of data at sufficient resolution for cities in China (see SM Section S3.2).