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Volume 9, Number 12—December 2003

Research

Risk Factors for Norovirus, Sapporo-like Virus, and Group A Rotavirus Gastroenteritis

Matty AS de Wit*1, Marion PG Koopmans*, and Yvonne THP van Duynhoven*Comments to Author 
Author affiliations: *National Institute of Public Health and the Environment, Bilthoven, the Netherlands

Main Article

Table 2

Risk factors for NV gastroenteritis in persons <1 year to 4 years of age (n = 105 pairs) and persons >5 years of age (n = 46 pairs), univariate and multivariate odds ratiosa,b

NV gastroenteritis <1 y to 4 y (n = 105 pairs) >5 y (n = 46 pairs)

OR uni
95% CI
OR multi
95% CI
PAR (%)
OR uni
95% CI.
OR multi
95% CI
PAR (%)
Food-handling hygiene
1.2
0.9 to 1.5
1.2
0.9 to 1.7
46
1.3
0.9 to 1.9
1.3
0.8 to 2.2
63
Household members with gastroenteritis




27




4
Yes
4.4
2.2 to 9.2
2.7
0.8 to 8.9

15.0
2.0 to 113.6
1.1
0.1 to 15.9

No
1.0
-
1.0
-

1.0
-
1.0
-

Contact with persons outside household with gastroenteritis




51




60
No
1.0
-
1.0
-

1.0
-
1.0
-

Yes
17.7
5.1 to 61.1
10.9
2.2 to 54.6

5.9
1.0 to 20.1
12.1
1.0 to 147.3

Do not know 2.4 1.2 to 4.7 2.7 0.9 to 7.8 0.8 0.2 to 3.0 1.8 0.2 to 15.3

aUsing logistic regression, and population-attributable risk fractions (PAR).
bNV, norovirus; OR, odds ratio; PAR, population-attributable risk fractions; uni, univariate; multi, multivariate; CI, confidence intervals; -, not applicable.

Main Article

1Current address of first author: Municipal Health Service, Department of Epidemiology, Documentation and Health Promotion, Nieuwe Achtergracht 100, 1018 WT Amsterdam, the Netherlands; email: mdwit@gggd.amsterdam.nl

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