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Volume 9, Number 2—February 2003

Research

Risk Factors for Sporadic Giardiasis: a Case-Control Study in Southwestern England

James M. Stuart*Comments to Author , Hilary J. Orr*, Fiona G Warburton†, Sugarthinny Jeyakanth†, Carolyn Pugh‡, Ian Morris‡, Joyshri Sarangi§, and Gordon Nichols¶
Author affiliations: *PHLS Communicable Disease Surveillance Centre (Southwest), Gloucester, U.K.; †PHLS Statistics Unit, London, U.K.; ‡Public Health Laboratory, Bristol, U.K.; §Avon Health Authority, Bristol, U.K.; ¶PHLS Communicable Disease Surveillance Centre, London, U.K.

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Table 3

Multivariable analysis of risk factors for giardiasis

Exposure Odds ratio
(95% CI)a p value
Swallowed water while swimming
6.2 (2.3 to 16.6)
<0.0001
Recreational fresh water contact
5.5 (1.9 to 15.9)
0.001
Each additional glass of tap water consumed per day
1.3 (1.1 to 1.5)
<0.0001
Ate lettuce
2.2 (1.2 to 4.3)
0.01
Ate ice cream 0.4 (0.2 to 0.7) 0.002

aCI, confidence intervals.

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