Public Health Equations

Question 0

Population Attributable Risk

• when you use it
• equation
• meaning

Answer 0

• cohort studied
• a+c/a+b+c+d - c/a+d
• how common exposure is

Question 1

Attributable Risk

• when you use it
• equation
• meaning

Answer 1

• cohort studied
• a/a+b - c/c+d
• deaths caused by exposure

Question 2

Relative risk

• when you use it
• equation
• meaning

Answer 2

• cohort studies
• a/a+b / c/c+d
• disease in exposed over disease unexposed

Question 3

Odds Ratio

• when you use it
• equation
• meaning

Answer 3

• case control
• ad/bc
• exposure/no exposure or disease/no disease

Question 4

Absolute Risk Reduction

• when you use it
• equation
• meaning

Answer 4

• clinical trials
• risk placebo - risk treatment
• reduction of risk with treatment

Question 5

Number Needed to Treat

• when you use it
• equation
• meaning

Answer 5

• clinical trials
• 1/ARR
• number needed to treat