Table 3.
Results from univariate analysis of cruise-ship exposures, showing number of participants with exposure, for exposures with P values <0·1 and percentage of cases exposed ⩾30%
| Cases | Controls | OR | 95% CI | P value | |||||
|---|---|---|---|---|---|---|---|---|---|
| Number exposed | N | (%) | Number exposed | N | (%) | ||||
| Lettuce | 24 | 31 | (77) | 40 | 95 | (42) | 4·71 | 1·7–14·1 | <0·001 |
| Spinach | 13 | 29 | (45) | 15 | 94 | (16) | 4·28 | 1·5–11·7 | 0·002 |
| Chives | 8 | 24 | (33) | 7 | 87 | (8) | 5·71 | 1·5–21·1 | 0·004 |
| Celery | 9 | 28 | (32) | 9 | 94 | (10) | 4·47 | 1·3–14·5 | 0·006 |
| Fruit salad | 14 | 31 | (45) | 19 | 95 | (20) | 3·29 | 1·2–8·5 | 0·007 |
| Kiwi fruit | 15 | 31 | (48) | 22 | 94 | (23) | 3·07 | 1·2–7·8 | 0·009 |
| Peppers | 16 | 29 | (55) | 28 | 94 | (30) | 2·90 | 1·1–7·5 | 0·012 |
| Cantaloupe | 19 | 31 | (61) | 31 | 95 | (33) | 2·71 | 1·1–7·9 | 0·015 |
| Carrots | 20 | 30 | (67) | 40 | 94 | (43) | 2·70 | 1·1–7·2 | 0·018 |
| Cucumber | 18 | 31 | (58) | 33 | 94 | (35) | 2·56 | 1·0–6·4 | 0·021 |
| Went ashore Singapore (cruise 1) | 27 | 31 | (87) | 66 | 97 | (68) | 3·17 | 1·0–13·4 | 0·029 |
| Broccoli | 17 | 31 | (55) | 32 | 94 | (34) | 2·35 | 0·9–5·8 | 0·033 |
| Spring onions | 9 | 30 | (30) | 13 | 92 | (14) | 2·60 | 0·8–7·6 | 0·049 |
| Tomatoes | 24 | 31 | (77) | 55 | 93 | (59) | 2·37 | 0·8–7·1 | 0·051 |
| Basil | 8 | 24 | (33) | 14 | 88 | (16) | 2·64 | 0·8–8·1 | 0·057 |
| Mushrooms | 11 | 29 | (38) | 21 | 93 | (23) | 2·10 | 0·8–5·5 | 0·083 |
| Watermelon | 20 | 31 | (65) | 46 | 96 | (48) | 1·98 | 0·8–5·1 | 0·08 |
| Cauliflower | 11 | 29 | (38) | 22 | 95 | (23) | 2·03 | 0·7–5·3 | 0·093 |
| Went ashore Singapore (cruise 2) | 26 | 30 | (87) | 71 | 97 | (73) | 2·38 | 0·7–10·2 | 0·098 |
N, Total number of respondents; OR, odds ratio; CI, confidence interval.