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The following odds ratios were calculated for differentfoods eaten by patrons at a restaurant buffet which was later connected with anoutbreak of Clostridium perfringens. Which one of the...
May 04, 2022
Briefly define event-based surveillance and describe some ofthe potential advantages and disadvantages of such systemsList three categories of information that should becollected in a...
May 04, 2022
For surveillance data, undercount is best defined as:(a) Cases recorded by local health department, but notreferred onto the national surveillance system(b) Cases not reported by a...
May 04, 2022
An increasing trend in surveillance data for a given diseasecan be accounted for by:(a) An increase in the incidence of a disease(b) Less testing of true cases(c) Use of a new database...
May 04, 2022
If early results from a trial were published after one yearof follow-up and then a second paper with longer follow-up was published a fewyears later, is it appropriate to include both of these...
May 04, 2022
What is meant by the term ‘grey literature’ and why is it agood idea to search this to identify potentially relevant studies for asystematic review? List three strategies you might use to identify...
May 04, 2022
Your case–control study has shown a halving of risk ofstroke among people who eat cauliflower three or more times weekly. Before youcan claim this association is causal, which of the following...
May 04, 2022
Go back to Table 8.7 and recalculate the crude (overall) andstratumspecific odds ratios assuming that the study had (i) half as many people(i.e. divide all the numbers of cases and controls by 2)...
May 04, 2022
Imagine that, when we were interested in the associationbetween energy intake and heart disease we had conducted a cohort study insteadof a case–control study. The results of this study are shown...
May 04, 2022
Does the position of the rider (driver or passenger) on themoped affect their chances of sustaining a head injury? (Hint – first calculatethe crude odds ratio for the association between moped...
May 04, 2022

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