3. An outbreak of gastrointestinal disease occurred 24-36 hours after people had

Question

3. An outbreak of gastrointestinal disease occurred 24-36 hours after people had attended a wedding. Of the 203 attendees (including the bride and groom), 200 completed questionnaires, and 50 reported illness compatible with the case definition. Tabulated food consumption histories are presented in the table below. Did Not Eat Specified Ate Specified Food Food WellTotal WellTotalIII III 46 Food Item Punch! (2500)| 138 | 184 |4(25%)| 12 | 16 Wedding 45 55 | 100 | 5(5%)| 95 | 100 40 | (21%) Cake (4590) 149 189 Sushil (91%)

Explanation / Answer

Answer - Atrribuatble risk percentage. - It is difference in rate of a condition between an exposed population and an unexposed population.

Chi square is used to test the hypothesis of the occurence of some specific problems.

Relative risk - is the ratio of the probability of an event occurring in an exposed group to the probability of the event occurring in a comparison, non-exposed group.

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