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Volume 7, Number 1—February 2001

Research

Gastroenteritis in Sentinel General Practices, the Netherlands

Matty A.S. de Wit*Comments to Author , Marion P.G. Koopmans*, Laetitia M. Kortbeek*, Nan J. van Leeuwen*, AAD I.M. Bartelds†, and Yvonne T.H.P. van Duynhoven*
Author affiliations: *National Institute of Public Health and the Environment, Bilthoven, The Netherlands; †Netherlands Institute of Primary Health Care, Utrecht, the Netherlands

Main Article

Table 1

Univariate and multivariate Poisson regression analyses of the incidence per 10,000 person years

Univariate Poisson Multivariate Poisson
regression regression
Crude
Incidence per 10,000 person years incidence RR 95% CI RR 95% CI
Study year
May 96-Apr 97 52.4 1.00 - 1.00 -
May 97-Apr 98 62.4 1.19 1.08-1.32 1.19 1.08-1.32
May 98-Apr 99 65.6 1.25 1.13-1.38 1.23 1.11-1.36
Participation in case-control study
Yes 65.8 2.51 2.13-2.97 2.71 2.28-3.22
No 26.2 1.00 - 1.00 -
Urbanization
Low 57.0 1.04 0.92-1.17 1.18 1.04-1.34
Intermediate 55.5 1.00 - 1.00 -
High 88.9 1.62 1.47-1.79 1.25 1.11-1.41
North 28.7 0.39 0.34-0.45 0.35 0.29-0.40
East 71.3 0.97 0.88-1.07 0.93 0.83-1.05
West 76.0 1.00 - 1.00 -
South 55.5 0.75 0.68-0.84 0.78 0.69-0.88
Gender
Male 56.8 1.00 - 1.00 -
Female 63.4 1.12 1.03-1.21 1.12 1.04-1.22
Age (in years)
0 360.4 5.53 4.49-6.82 5.54 4.50-6.83
1-4 221.5 3.40 2.94-3.94 3.36 2.90-3.89
5-14 65.1 1.00 - 1.00 -
15-24 51.7 0.79 0.67-0.94 0.79 0.67-0.93
25-39 55.9 0.86 0.75-0.98 0.84 0.73-0.97
40-64 36.5 0.56 0.48-0.65 0.56 0.48-0.65
>65 47.7 0.73 0.62-0.87 0.72 0.61-0.85

RR = relative risk; CI = confidence interval.

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