Volume 1, Number 1—January 1995
Dispatch
An Outbreak of Shigella sonnei Infection Associated with Consumption of Iceberg Lettuce
Table 2
Sh. sonnei case control study Single variable matched analysis
Case (n=27) |
Control (n=44) |
|||||||
---|---|---|---|---|---|---|---|---|
Did not | Did not | No. of | ||||||
Food | Ate | eat | % ate | Ate | eat | % ate | sets | p-value |
Prawns | 4 | 22 | 15 | 7 | 37 | 15 | (26s) | 0.9388 |
Shrimps | 0 | 27 | 0 | 1 | 43 | 2 | (27s) | 0.3070 |
Steak | 7 | 19 | 27 | 6 | 37 | 14 | (26s) | 0.0139 |
Burgers | 5 | 22 | 19 | 12 | 32 | 27 | (27s) | 0.2045 |
Salad | 25 | 2 | 93 | 34 | 10 | 77 | (27s) | 0.0081 |
Cold meats | 15 | 10 | 60 | 29 | 13 | 69 | (23s) | 0.7708 |
Tomatoes | 22 | 4 | 85 | 33 | 11 | 75 | (26s) | 0.1039 |
Spring onions | 5 | 21 | 19 | 9 | 35 | 21 | (26s) | 0.7556 |
Celery | 5 | 22 | 19 | 5 | 39 | 11 | (27s) | 0.2956 |
Cucumber | 16 | 11 | 59 | 31 | 13 | 71 | (27s) | 0.3798 |
Other salads | 16 | 10 | 62 | 26 | 18 | 59 | (26s) | 1.0000 |
Lettuce | 25 | 2 | 93 | 31 | 13 | 71 | (27s) | 0.0007 |
Cos lettuce | 2 | 20 | 9 | 3 | 25 | 11 | (17s) | 1.0000 |
Webb's lettuce | 5 | 18 | 22 | 4 | 34 | 11 | (21s) | 0.2632 |
Lamb's lettuce | 2 | 17 | 11 | 6 | 36 | 14 | (19s) | 0.1002 |
Raddicio lettuce | 4 | 20 | 17 | 7 | 34 | 17 | (23s) | 0.8720 |
Iceberg lettuce | 17 | 8 | 68 | 19 | 23 | 45 | (25s) | 0.0023 |
Frisee lettuce | 5 | 18 | 22 | 4 | 37 | 10 | (22s) | 0.2582 |
Home | 15 | 8 | 65 | 27 | 16 | 63 | (23s) | 0.8494 |
Restaurant | 6 | 16 | 27 | 5 | 33 | 13 | (21s) | 0.1546 |
Pub | 4 | 18 | 18 | 2 | 34 | 6 | (20s) | 0.0795 |
Other outlet | 10 | 14 | 42 | 7 | 31 | 18 | (22s) | 0.0012 |