Volume 7, Number 1—February 2001
Research
Gastroenteritis in Sentinel General Practices, the Netherlands
Matty A.S. de Wit*
, Marion P.G. Koopmans*, Laetitia M. Kortbeek*, Nan J. van Leeuwen*, AAD I.M. Bartelds†, and Yvonne T.H.P. van Duynhoven*
, Marion P.G. Koopmans*, Laetitia M. Kortbeek*, Nan J. van Leeuwen*, AAD I.M. Bartelds†, and Yvonne T.H.P. van Duynhoven*
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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