Class Notes (1,100,000)
US (440,000)
UC-Irvine (10,000)
PUBHLTH (600)
Lecture 14

PUBHLTH 101 Lecture Notes - Lecture 14: Attributable Risk, Ecological Study, Odds Ratio


Department
Public Health
Course Code
PUBHLTH 101
Professor
David Timberlake
Lecture
14

This preview shows half of the first page. to view the full 2 pages of the document.
LEC 14
Disadvantages:
Very expensive, lengthy
Not ideal for rare diseases
Criteria and method may change over time
Usually only study risk factors measured at start of study can be examined
Have selection bias and information bias compared to RCT
High attrition can affection validity of the findings
Attrition: term used to describe loss of subjects over long period of time
Two angles we may concern regarding eliminating exposure
From the perspective of the impact of eliminating the exposure on only those
who are exposed (smokers)
Example:
How much of lung cancer risk experienced by smokers can be attributable
to smoking?
CALCULATION OF AR:
Subtracting the incidence of the unexposed (Iu) from the
incidence of the exposed (Ie)
AR = Ie - Iu
Attributable risk (AR):
portion of the incidence of a disease in the exposed that
is due to the exposure
The incidence of a disease in the exposed that would be eliminated if
exposure was eliminated
AR%
is also called the
Attributable Risk Fraction,
the
Etiologic Fraction,
and the
Exposed Attribution Fraction Exposed
AR% = Ie - Iu x 100
Ie
AR% = AR x 100
You're Reading a Preview

Unlock to view full version