Fig. 3From: Epidemiological and clinical based study on four passages of COVID-19 patients: intervention at asymptomatic period contributes to early recoveryComparisons of nucleic acid positive periods. P < 0.01 for comparison of nucleic acid from positive to negative among P2, P3 and P4 groups. **P < 0.01 for comparison of P2 and P4 groups, and *P < 0.05 for comparison of P3 and P4 groups. One-way ANOVA was performed with post hoc testBack to article page