Fig. 4

Results of the Omicron-Booster-RCIR for just the Omicron wave with the additional inclusion of an interaction effect between the relative completed primary series rate and the relative booster rate. a: Two-dimensional contour plot for the interaction between relative completed primary series rate and relative booster rate. b-g: Accumulated local effects (ALE) of dynamic variables. Shaded areas in each plot indicate 95% confidence intervals. h: Estimated slopes for each static variables, the upper and lower band indicate 95% confidence intervals. ‘***’: variable significant at p < 0.001. ‘**’: variable significant at p < 0.01. ‘*’: variable significant at p < 0.05. ‘’: variable significant at p > 0.05