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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.

Main Article

Table 1

Single variable analysis of risk factors for giardiasis: drinking water exposures

Risk factor Cases (n=192) Controls
(n=492) Matched odds ratio (95% CI)a p value
Consumed tap water
No
17
79


Yes
174
410
2.3 (1.1 to 4.9)
0.02






Usual no. of glasses of tap water consumed per day (glass=approx 1/3 pint)
0.0
17
79


0.5–1.0
22
71


1.5–2.0
52
150


2.5–3.0
23
46


3.5–4.0
23
41


4.5–5.0
20
41


>5.0
33
61
1.2 (1.1 to 1.4)b
<0.0001






Consumed bottled water
No
154
406


Yes
38
83
1.6 (0.9 to 2.9)
0.1






Usual no. of glasses of bottled water consumed per day
0
154
406


1
12
29


2
19
32


3
5
13


4
1
8
1.2 (0.9 to 1.6)b
0.3






Used water filter at home
No
157
387


Yes
34
104
0.9 (0.5 to 1.7)
0.8






Type of water supply
Public
187
483


Private
3
3
0.05 (0.002 to 1.11)
0.04






Had a disruption in the water supply No
124
447


Yes 6 11 3.6 (0.6 to 20.8) 0.2

aCI, confidence intervals.
bFor each additional glass.

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