Chapter 7 (epidemiology)

Odds Ration

OR>1= exposed have more of outcome then unexposed

OR=1 = no association

OR<1= exposed have less of outcome then expected

Relative risk

Is a ratio measure

HR is similar to relative risk

Comparing incidence (risk)

Good for determining causality

**Risk of disease in the exposed group/ risk in unexposed**

Develop is key word

RR>1= exposed have more of risk outcome then unexposed

RR=1 = no association

RR<1= exposed have less of risk outcome then expected

**Division**

ratio measures (comparing relative strength of association x->y) **does x cause y?**

**Subtraction**

difference measures (comparing absolute differences in effect of x on y) **what's the public health impact of x on y?**