Many cities implement both policies. However, it is not conclusive to ascertain the effect of further imposing family outdoor restrictions in cities that have adopted closed management of communities. When both policies are included in the model, the OLS coefficients (column (5)) indicate that closed management reduces the transmission rate by 0.547 (95% CI, −0.824∼−0.270) in the first week, and by 0.259 (95% CI, −0.485∼−0.032) in the second week, while the additional benefit from stay at home is marginally significant in the second week (− 0.124, 95% CI, −0.272∼0.023). The IV estimates indicate that closed management reduces the transmission rate in the first week by 0.193 (95% CI, −0.411∼0.025), while the effect in the second week and the effects of stay at home are not statistically significant. Additional research that examines the decision process of health authorities or documents the local differences in the actual implementation of the policies may offer insights into the relative merits of the policies.