Volume 11, Number 2—February 2005
Research
Sporadic Cryptosporidiosis Decline after Membrane Filtration of Public Water Supplies, England, 1996–2002
Stella Goh*, Mark Reacher†
, David P. Casemore‡, Neville Q. Verlander§, André Charlett§, Rachel M. Chalmers¶, Margaret Knowles#, Anthony Pennington*, Joy Williams*, Keith Osborn**, and Sarah Richards††
, David P. Casemore‡, Neville Q. Verlander§, André Charlett§, Rachel M. Chalmers¶, Margaret Knowles#, Anthony Pennington*, Joy Williams*, Keith Osborn**, and Sarah Richards††
Table 5
Poisson regression model of the incidence of sporadic cryptosporidiosis*
| Predictor | Category | IRR | 95% CI | p |
|---|---|---|---|---|
| Membrane filtration | No | Reference | ||
| Yes | 0.207 | 0.099–0.431 | < 0.0001 | |
| Foot and mouth disease epidemic | Pre | Reference | ||
| During | 0.394 | 0.167–0.925 | ||
| Post | 0.686 | 0.292–1.612 | 0.05 | |
| Water supply | Crummock | Reference | ||
| Ennerdale | 0.907 | 0.620–1.329 | ||
| Other | 0.820 | 0.573–1.174 | 0.6 |
*IRR, incidence rate ratio; CI, confidence interval. Goodness-of-fit test (chi square 10.84, 9 df, p = 0.3).
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