Week 5

A case-control study was conducted to find the source of an outbreak. The odds ratio for eating cole slaw is defined to be the odds ratio for cases divided by the odds ratio for controls. For the following scenarios what would be the odds ratio?

Cases have an odds for eating coleslaw three times higher than controls.

• 0.33

• 0

• 1

• 3

A case-control study was conducted to find the source of an outbreak. The odds ratio for eating coleslaw is defined to be the odds ratio for cases divided by the odds ratio for controls. For the following scenarios what would be the odds ratio?

Cases have the same odds ratio for eating coleslaw as controls

• 0.33

• 0

• 1

• 3

A case-control study was conducted to find the source of an outbreak. The odds ratio for eating coleslaw is defined to be the odds ratio for cases divided by the odds ratio for controls. For the following scenarios what would be the odds ratio?

Controls have three times the odds ratio for eating coleslaw as cases.

• 0.33

• 0

• 1

• 3

A recent study of measles and measles vaccination demonstrated a cumulative incidence of measles of 147 per 100,000 in unvaccinated children, and only 4 per 100,000 in vaccinated children. Based on this data one can calculate that: The absolute risk reduction due to vaccination (i.e. risk difference) is

• 143/100,000 or 0.00143

• 147/100,000 or 0.00147

• 4/100,000 or 0.00004

• 144/100,000 or 0.00144

​ (a)   is a measure of the

strength of the association or causal link between a risk factor and an outcome.

• Relative Risk (RR)
• Attributable risk(AR)
• Population attributable risk(PAR)
• Population attributable risk percent (PAR%)

(a)   helps measure the excess risk associated with the risk factor.

• Attributable risk (AR)
• Relative risk (RR)
• Population attributable risk (PAR)
• Population attributable risk percent (PAR%)

​ (a)   depends not only on the excess risk imposed by the exposure, but also on the share of the total population that is exposed. Ie. gives the absolute added risk in relation to the total population.

• Population attributable risk (PAR)
• Relative risk (RR)
• Population attributable risk percent (PAR%)
• Attributable risk (AR)

​ (a)   gives the percent of cases in the total population that can be attributed to the risk factor.

• Population attributable risk percent (PAR%)
• Population attributable risk (PAR)
• Relative risk (RR)
• Attributable risk (AR)