Table 3. Risk factors for gastroenteritis in the matched case-control study (612 paired participants).
| Exposure | Univariate analysis | Multivariate modelb | ||
| OR | 95% CI | Adjusted OR | 95% CI | |
| Taking antacids within 1 month prior to illness |
3.38 | (2.34, 4.88) | 4.10 | (2.57, 6.53) |
| Household members/classmates with gastroenteritisa |
4.64 | (2.92, 7.35) | 4.69 | (2.76, 7.96) |
| Attending a banqueta | 2.50 | (1.91, 3.27) | 2.29 | (1.64, 3.20) |
| Dining outa | 2.32 | (1.68, 3.20) | 1.70 | (1.13, 2.54) |
| Eating raw oystersa | 2.82 | (1.62, 4.91) | 3.10 | (1.61, 5.94) |
| Eating honey peachesa | 1.91 | (1.14, 3.20) | — | — |
| Drinking bottled watera | 1.66 | (1.30, 2.12) | — | — |
| Eating shrimp/craba | 1.45 | (1.16, 1.83) | — | — |
| Attending open-air banqueta | 5.33 | (1.55, 18.30) | — | — |
| Eating at a Chinese/Western restauranta | 2.45 | (1.83, 3.28) | — | — |
| Eating at street cateringa | 2.50 | (1.35, 4.65) | — | — |
| Eating at a noodle shopa | 1.35 | (1.03, 1.76) | — | — |
| Eating raw fisha | 1.57 | (1.16, 2.13) | — | — |
| Eating clam/shells (other than raw oysters)a |
1.54 | (1.21, 1.96) | — | — |
| Changing a diapera | 1.73 | (1.11, 2.72) | — | — |
| Eating a cold side disha | 1.27 | (0.99, 1.63) | — | — |
| Eating salada | 1.19 | (0.94, 1.50) | — | — |
| Eating porka | 1.17 | (0.87, 1.58) | — | — |
| Eating beefa | 1.14 | (0.89, 1.44) | — | — |
CI, confidence interval; OR, odds ratio.
aExposed to these factors within 1 week prior to illness.
bOdds ratio and 95% confidence interval were derived from conditional logistic regression after stepwise selection.