September 7, 2021 Analysis of BC regional data
This page shows results of analyses reported in our regular BC COVID-19 Modelling Group reports.
Fits to each health authority case data
The public health measures brought into force for the Interior Health Authority in late July have successfuly reduced the growth rate to nearly zero. The growth rates in the other regions have also reduced significantly.
The effect of the province-wide mask mandate instituted on August 25 may not be influencing the growth rate of reported cases. As usual, transmission rates estimates have large uncertainty soon after changes. Another week of data will improve the estimates substantially. Hospitalization projections are not included in this analysis, since growth rates are not yet established.
The following shows graphs of daily cases on linear and log scale. The curves show the best fit at this time, the table below shows uncertainty in the growth rate estimates.
BC total
Fraser
Interior
Island
Coastal
Northern
Summary of growth rates estimates
The table below indicates the growth rates (shown as percent per day) for each region for recent analyses. The trend to reduced growth rates is evident. Typical uncertainty (68% CL) is a 1%/day, but for the current estimates, the uncertainties are larger, so are included in the table.
| Region | July 28 | Aug 3 | Aug 10 | Aug 16 | Aug 24 | Aug 30 | Sept 7 |
|---|---|---|---|---|---|---|---|
| BC | +9% | +9% | +9% | +8% | +3% | +2% | +1% +/- 1% |
| Fraser | +8% | +7% | +8% | +7% | +7% | +3% | +2% +/- 1% |
| Interior | +12% | +11% | +8% | +6% | +1% | 0% | -1% +/- 1% |
| Coastal | +6% | +6% | +7% | +7% | +6% | +2% | -2% +/- 3% |
| Island | - | +7% | +9% | +9% | +7% | +4% | -3% +/- 4% |
| Northern | - | +14% | +15% | +14% | +10% | +5% | +5% +/- 3% |