Fig 1.
Temporal variations in COVID-19 percentage positivity and population-level median Ct values.
The graph displays the COVID-19 percentage positivity per month (left y-axis) and monthly median Ct values (right y-axis) between June 2020 and December 2021.
Fig 2.
Correlation between Ct values and number of cases in the subsequent month.
The correlation between monthly median Ct values and the number of positive cases in the subsequent months (r = -0.588, p<0.05).
Fig 3.
Correlation between Ct values from symptomatic and asymptomatic patients and the number of cases in the subsequent months.
(a) Correlation between Ct values for symptomatic patients with the number of positive cases in the subsequent months (r = -0.167, p<0.05). (b) Correlation between Ct values for asymptomatic patients with the number of positive cases in the subsequent months (r = -0.598, p<0.05).
Fig 4.
Actual and predicted cases using a linear regression model generated from monthly median Ct values.
(a) The model was generated using Ct values for all COVID-19 cases. (b) The model was generated using Ct values of asymptomatic COVID-19 cases. The models were generated with Ct values of COVID-19 cases between Jun 2020 and Feb 2021. Data collected from Mar 2021 until Dec 2021 were used to validate the forecasting estimates.