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.