Table. Description of matched case–control pairs with exposure status defined as being supplied with salad leaves by Supplier A, Escherichia coli O157 outbreak, United Kingdom, June 2016 (n = 43).
| Case exposed/ control exposed |
Case exposed/ control unexposed |
Case unexposed/ control exposed |
Case unexposed/ control unexposed |
Total | ||
|---|---|---|---|---|---|---|
| Number of pairs | 7 | 23 | 3 | 10 | 43 | |
| Venue type | Restaurant | 2 | 6 | 0 | 2 | 10 |
| Bar | 0 | 1 | 0 | 0 | 1 | |
| Pub | 1 | 6 | 1 | 5 | 13 | |
| Café | 4 | 10 | 2 | 1 | 17 | |
| Takeaway | 0 | 0 | 0 | 2 | 2 | |
| Mean pair distance (km) | 1.13 | 1.37 | 0.54 | 2.03 | 1.43 | |
| Pairs where the case had eaten at another case venue linked to Supplier A | 0 | 0 | 1 | 2 | 3 | |
| Pairs where more than one case ate at the case venue | 2 | 5 | 0 | 0 | 7 | |