|
Matched univariate analysis (matched "Mantel-Haenszel" odds ratio: mOR) and multivariate conditional logistic regression analysis (adjusted odds ratio: aOR). Cases of Norovirus infection (n = 41) and Controls (n = 41) according to investigated risk factors |
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| Univariate analysis |
Multivariate analysis |
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|
|
|
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| Risk factors(*) |
Cases (%) |
Controls (%) |
mOR |
95% CI |
p-value |
aOR |
95% CI |
p-value |
|
|
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| Ice |
21/41 (51) |
12/41 (29) |
4.1 |
(0.9–7.1) |
0.04 |
16.4 |
(1.8–250.9) |
0.04 |
| Eggs |
2/41 (5) |
8/41 (19) |
2.3 |
(0.1–1.7) |
0.12 |
- |
- |
- |
| Grilled sausage |
21/41 (51) |
25/41 (61) |
0.7 |
(0.2–1.7) |
0.17 |
- |
- |
- |
| Ham |
1/41 (2) |
5/41 (12) |
2.8 |
(0.1–1.7) |
0.09 |
- |
- |
- |
| Grilled meat |
11/41 (27) |
15/41 (37) |
3.5 |
(0.1–1.1) |
0.06 |
- |
- |
- |
| Snacks |
20/41 (49) |
19/41 (46) |
0.1 |
(0.4–2.8) |
0.15 |
- |
- |
- |
| Raw mussels |
22/41 (54) |
13/41 (31) |
3.9 |
(0.9–6.8) |
0.04 |
25.5 |
(1.5 – 442.9) |
0.03 |
|
(*) In the univariate analysis, only Risk Factors with p-value<0.20 are reported; in the multivariate analysis, only variables selected by the conditional logistic model according to a log-likelihood-ratio test for goodness-of-fit are reported. | ||||||||
Rizzo et al. BMC Infectious Diseases 2007 7:135 doi:10.1186/1471-2334-7-135 |
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