The microsimulation model was built in R (Version 3.6.3; R Development Core Team, Vienna, Austria). Each model was simulated 1000 times using bootstrapped samples of the same size as the original ECLS-K:2011 (n = 15,631), based on which the mean, standard error, and 95% confidence interval (CI) of the impacts of COVID-19 under different scenarios were estimated. The ECLS-K:2011 sampling weights were incorporated in the effect estimation to facilitate modeling result generalization to the national kindergarten population.34
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