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Lecture 15

PUBHLTH 101 Lecture Notes - Lecture 15: Prospective Cohort Study, Cohort Study, Three Steps


Department
Public Health
Course Code
PUBHLTH 101
Professor
David Timberlake
Lecture
15

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LEC 15
Ecological studies are experimental studies
Example that can be used to calculate incidence rate:
A cohort study: we follow up all residents without colon cancer in Irvine from Jan,
2019 to Dec. 2019 to collect information of newly diagnosed colon cancer
In a case-control study, which of the following statement about selection of controls is
undesirable?
Hospital-based controls have a disease related to study exposure
Which of the following is NOT an advantage of a prospective cohort study
It usually costs less than a case control study (usually costs MORE)
All case control studies are characterized by the following except:
Incidence rates may be computed directly
Which of the following is an advantage of the cross-sectional study design over the other
study designs
I.D
R.R
R.R
R.R.
28 x 1000 = 1.87 per 1000
py
15,000
1.87 / 1.87 = 1
1.87/3.52 =
0.5313
1.87/6.5=0.2877
44 x 1000 = 3.52 per
1000 py
12,5000
3.52/1.87=1.8824
3.52/3.52=1
3.52/6.5=0.5415
468 x 1000 = 468000 6.5
per 1000 py
10,4000
6.5/1.87=3.4759
6.5/3.52=1.8466
6.5/6.5=1
Cases
Eaten Cantaloupe
20
Did not eat
Cantaloupe
15
35
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