Name | Measure | Conditions | Interpretation |
Time ratio | β1/β2 | β1≥0≥β2 | Ratio of exponential slopes: the number of days under lockdown required to balance a single day of previous behaviour |
Leeway | (1-R0lockdown)/R0lockdown | R0lockdown ≤1 | Increasing contacts between individuals by this proportion of their level under lockdown would raise R to 1 |
Reclaimable fraction | (1-R0lockdown)/(R0before-R0lockdown) | R0before≥1≥R0lockdown | The proportion of the contacts between individuals forgone under lockdown that could be resumed without raising R beyond 1 |
Stop limit | R0before/R0lockdown | R0lockdown ≤1 | Maximum initial R0 for lockdown to be able to stop the epidemic |
β1/β2: slopes of the exponential periods before and under lockdown; R0before/R0lockdown: the reproduction number of coronavirus 2019 before and during lockdown.