Volume 8, Number 1—January 2002
Research
A Large Outbreak of Legionnaires’ Disease at a Flower Show, the Netherlands, 1999
Jeroen W. Den Boer*†
, Ed P.F. Yzerman‡, Joop Schellekens*, Kamilla D. Lettinga§, Hendriek C. Boshuizen*, Jim E. Van Steenbergen¶, Arnold Bosman*, Susan Van den Hof*, Hans A. Van Vliet*, Marcel F. Peeters#, Ruud J. Van Ketel§, Peter Speelman§, Jacob L. Kool*, and Marina A.E. Conyn Van Spaendonck*
, Ed P.F. Yzerman‡, Joop Schellekens*, Kamilla D. Lettinga§, Hendriek C. Boshuizen*, Jim E. Van Steenbergen¶, Arnold Bosman*, Susan Van den Hof*, Hans A. Van Vliet*, Marcel F. Peeters#, Ruud J. Van Ketel§, Peter Speelman§, Jacob L. Kool*, and Marina A.E. Conyn Van Spaendonck*
Table 3
Logistic regression model of data from questionnaires and drawings comparing host factors and visits to specific sites at the exhibition for cases and controls
| Study population | Respondents to questionnaire and set of drawings; ORa (95% CI)(101 cases, 119 controls) |
|---|---|
| Age | 1.1 (1.0 - 1.1) |
| Male sex | 2.1 (1.0 - 4.5) |
| Smoking | 6.0 (2.4 - 15.1) |
| Total hours at exhibition | 2.2 (1.5 - 3.2) |
| Hours at consumer exhibition | 0.5 (0.3 - 0.8) |
| Pausing at whirlpool spa in hall 3b | 2.6 (1.1 - 6.6) |
| Pausing at bubblemat in hall 3b | 3.0 (1.1 - 8.0) |
| Pausing in gangway of bubblemat in hall 3b | 0.3 (0.1 - 0.8) |
aOR = odds ratio; CI = 95% confidence interval.
bSee Figure 3a.
1A bubblemat is an inflatable rubber mat that causes a whirlpool-like effect when placed in a normal bathtub.
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