Quantifying the Effect of Public Activity Intervention Policies on COVID-19 Pandemic Containment Using Epidemiologic Data From 145 Countries.

All interventions give average estimates significantly < 0, among which the estimate of international travel controls is marginally significant.

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The descriptive results from Figure 2 show that R t demonstrated a decreasing trend before the intervention, which suggested that apart from the 8 interventions, some other unobserved factors such as public self-protective measures also had an effect on transmission reduction.

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