Document: (which was not peer-reviewed) The copyright holder for this preprint . https://doi.org/10.1101/2020.02.29.20029348 doi: medRxiv preprint normal distribution, while Chi-square tests were applied to compare categorical variables between the two groups. Multivariate logistic regression analyses were applied to control baseline confounders. Covariates for logistic regression were those variables with significant differences between the two groups in baseline. All P values were two sided with a significance level of 0.05. Tendency of significant difference was judged when 0.05
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