Fig. 1

Model for changes of the time-varying reproduction number R_t as a piece-wise linear function. Dates d₁ and d₂ were estimated from mobility data. Date d₀ and values for R_t,0 – R_t,2 were estimated from incidence data on diagnosed cases and deaths. a. model-2 used for all countries; b. model-3p additionally used for Slovakia, which allowed an extra change during lockdown with dates d₀, d₃ and d₄, and values for R_t,0 – R_t,3 estimated from incidence data on diagnosed cases and deaths