highly significantp-value < 0.001
These factors were significant only in the previous negative tests for COVID-19, previously quarantined patients (97.1% and 70.6%, p-value = 0.001 and 0.002 respectively) and for contact tracing Vietnamese measures (p-value = 0.011) but highly significant concerning age component (mean = 62, SD = 14.6, p-value < 0.001 ).