Fig. 1From: Is a tiered restrictions system an effective intervention for COVID-19 control? Results from Portugal, November-December 2020Study design. T1– Beginning of tiered restrictions system; T2– Change tier; T3– Change tier and ending of tiered restrictions system; GR– Growth rate calculated between each time point (W1-W5); GRR– Growth rate ratio calculated between T1-T2, T2-T3 and T1-T3; 7-day cumulative incidence calculated each week considering 7 days beforeBack to article page