Table 3.
Infection proportion among within-vehicle groups: observed (expected) values
| No. of Patient Occupants Sharing | No. of Vehicle Groups of This Type | No. of Patient Occupants Developing COVID-19 | |||||
|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | ||
| 1 | 56 | 43 (43.5) | 13 (12.5) | ||||
| 2 | 49 | 27 (29.6) | 19 (17.0) | 3 (2.4) | |||
| 3 | 66 | 30 (31.0) | 23 (26.6) | 10 (7.7) | 3 (0.7) | ||
| 4 | 32 | 13 (11.7) | 12 (13.4) | 5 (5.8) | 1 (1.1) | 1 (0.1) | |
| 5 | 9 | 3 (2.5) | 2 (3.6) | 3 (2.1) | 1 (0.6) | 0 (0.1) | 0 (0.0) |
Data are the number of vehicle groups in each category given as observed (expected). Expected values are calculated from the binomial distribution, with probability 0.221. Number of patients =525. Number of vehicle groups =212.