Table 2. Risk factors of the norovirus acute gastroenteritis outbreak.
| Cases(N = 69) | Controls(N = 70) | Odds ratio(95% CI) | |||
|---|---|---|---|---|---|
| Yes N(%) | No N(%) | Yes N(%) | No N(%) | ||
| Barrelled water | 69(100.00) | 0(0) | 54(77.14) | 16(22.86) | 20.15(2.59–156.76) |
| Bottled water | 59(85.51) | 10(14.49) | 25(35.71) | 45(64.29) | 0.31(0.13–0.70) |
| Boiled water from home | 2(2.90) | 67(97.10) | 4(5.71) | 66(94.29) | 0.49(0.09–2.78) |
| Boiled barrelled water | 16(23.19) | 53(76.81) | 25(35.71) | 45(64.29) | 0.36(0.16–0.77) |
| Share cups | 14(20.29) | 55(79.71) | 11(15.71) | 59(84.29) | 0.46(0.30–1.72) |
| Closest classmate got diseased | 52(75.36) | 17(24.64) | 63(90.00) | 7(10.00) | 3.66(0.96–6.11) |
| Saw vomiting | 21(30.44) | 48(69.56) | 16(22.86) | 54(77.14) | 1.12(0.31–1.41) |
| Touched vomit | 7(10.14) | 62(89.86) | 4(5.71) | 66(94.29) | 0.98(0.15–1.89) |