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. 2013 Nov 7;8(11):e78371. doi: 10.1371/journal.pone.0078371

Table 2. Exposure specific attack rates, relative risks and 95% confidence intervals, Triathlon competitions, Copenhagen, 2010 and 2011.


Exposed
Unexposed
Exposure
Total Cases AR Total Cases AR RR 95% CI
2010 competition:
Participated in pre-competition dinner1 354 157 44.4 484 194 40.1 1.1 0.94-1.3
Participated in social event with meals2 31 12 38.7 806 338 41.4 0.92 0.59-1.4
Food 1 served during competition3 722 289 40.0 110 57 51.8 0.77 0.63-0.94
Food 2 served during competition4 724 301 41.6 102 45 44.1 0.94 0.75-1.2
Swallowed water5 475 239 50.3 172 35 20.4 2.5 1.8-3.4
Swallowed water, secondary case definition6 475 105 22.1 172 9 5.2 4.2 2.2-8.2
Female gender 112 59 52.7 726 292 40.2 1.3 1.1-1.6
Non-Danish nationality 238 107 45.0 600 244 40.7 1.1 0.93-1.3
Age <38 years 395 176 44.6 443 175 39.5 1.1 0.96-1.3
2011 competition:
Participated in social event with meals 319 30 9.4 612 48 7.8 1.2 0.78-1.9
Swallowed water 540 50 9.3 211 11 5.2 1.8 0.94-3.3
Swallowed water, secondary case definition 540 24 4.4 211 4 1.9 2.3 0.82-6.7
Female gender 126 20 15.9 805 58 7.2 2.2 1.4-3.5
Non-Danish nationality 177 26 14.7 750 52 6.9 2.1 1.4-3.3
Age <38 years 545 48 8.8 386 30 7.8 1.1 0.73-1.8

AR = attack rate; RR = relative risk; CI = confidence interval.

1Dinnerparty arranged by the Copenhagen Challenges organizers for the participants the evening before the Ironman competition 2010.

2Social events arranged by the participants themselves, e.g. the different Triathlon teams.

3Snack at the first transition zone (T1) and during the bike course.

4Snack at the second transition zone (T2) and during the marathon run course.

5Participants suffering from diarrhoea and/or vomiting.

6Participants suffering from diarrhoea and at least two of the following symptoms: vomiting, stomach cramps, fever, nausea, dizziness or headache.