TABLE 1.
Ratio of COVID-19 Test Positive Incidence to That Expected Based on the Case Rate of an Affiliated Institution Over 40 Consecutive Weeks in 2020
| Four Week PeriodCalendar Year 2020 | Ratio of Observed to Expected Cases | 95% CI | P |
| 3/17–4/13 | 3.51 | 1.7–6.8 | <0.05 |
| 4/14–5/11 | 2.75 | 0.49–10.4 | 0.13 |
| 5/12–6/08 | 3.96 | 0.66–17.4 | 0.07 |
| 6/09–7/06 | 0.38 | 0.01–2.30 | 0.5 |
| 7/07–8/03 | 1.19 | 0.56–2.29 | 0.6 |
| 8/04–8/31 | 0.91 | 0.24–2.49 | >0.9 |
| 9/01–9/28 | 1.23 | 0.14–4.92 | 0.7 |
| 9/29–10/26 | 1.63 | 0.31–5.39 | 0.4 |
| 10/27–11/23 | 1.54 | 0.71–3.00 | 0.2 |
| 11/24–12/21 | 0.64 | 0.35–1.08 | 0.09 |