Study design summary

0410912020
CLASSIFICATION -
EPIDEMIOLOGICAL STUDY DESIGN . Measure of Association #VARlAILE-
✓
-
'
✓
cross-sectional


(
↳ or Independent Dependent
'
ObjofepdemO0gds
" ewn 'M
:
,
[ Exposure] ( outcome]
ppg cohort ⑨ Close contact Eu could 19
'M
COULD 19 Disease
-




→① patient
of the diseases
TO identify risk factors .




Outcome
→ ② To determine the magnitude
t distribution of diseases Intervention

in the community , population .
⑨ H N , vaccine
S prevent Avianfhu
for the healthcare delivery
→③ To evaluate new preventive -1 therapeutic values '




ponenndycanfhwuv the other .




→④ To provide data for planning , providing control + therapeutic preventive
for the diseases .
→ sfystematec Review ]

classification:

I#
✓
→
EPIDEMIOLOGIC STUDY


N0n-mteruenHonalmm
(
examines the differences b/w
pgmniigeneammgnenanto.IR
→
Interventional study
:
preventing factor ( drugs vaccine
observational study groups than in individuals .

Experimental → Introduction of disease

exposing Removal of disease causing factor Ces
,
of the factors
Indydetermine
①
Ecological

f)
Natural exposure hat
(assigned # carcinogen)
m u r m u ro u s
T the ummm
mmmm



#
Study magnitude t distribution of
disease
disease r
IT
f) →②
.

y
-

✓
Hypothesis V

Descriptive ↳ No hypothesis
Analytical Y>Interventional Community that
field that
.




pc> assigned
to
↳ no comparison group ↳ comparison
Group patients ↳ Intervention ↳ Intervention assigned to
↳
whole
⑨ case report ARRI
} measure of Association
small group
①
Individual
-

assigned to individual communities
⑤ case series - HORI community member .


evaluation t time
Clinical
history Both exposuret outcome collected at one point on
→
④ cross-sectional study (exposure ← outcome]
④ cross -
sectional
-


comparison b/w Descriptive t
① prevalence study ① case control study outcome → exposure
interventional
- -




Non
.


-


↳ starts with disease .l outcome
.




① Cross section Of population ① Cohort
study T y
-




at one point in time
.
a
exposure -8 Outcome




.ws/: : tn:mg..: :. n
↳ starts
Descriptive Analytical
.


from exposure

① Longitudinal -




⑨ observations are repeated ⑤ Involves study of the population . mollies study of the

in the same population over a
Distribution
population .




8tudyfmagmp.de of disease
.




prolonged period of time . ⑨
,
.

0Stndy of determinants of disease
① Surveillance 1 frequent cross-sectional study .




÷÷ii÷÷÷:÷ :* .nu#:ii:ie:eiiEiiiinn.a+ion:::::::::::i
prevalence -7 Descriptive cross-sectional
.

Analytical
.

Ann ,yµca, → Study case control

so cases # ⑦ Associated factors → Analytical ④ Sectional .


>
Incidence .




-
case control
→ souse matched control
Shoup Data ⑨ prevalence .
⑨ use Measure
-




of Association .




-
follow up + control group → Cohort Analysis )
mortality .

, /¥¥%Fh%F/°""m#
comparison of Disease frequency Remember Independent Dependent 0210912020

COHORT STUDY DESIGN → Dr
btw groups exposed to risk factor .
Variable variable .




Sujata

⑥iT=TTTmIL] ' """" " " " "" " " " "" "




① Cohorts are identified prior to the appearance of Cg # OCP Breast Ca

disease under study .

smoking Lung carcinoma

②
→




Disease observed over a period of time .




ATTRITION
③ cause to effect .




withNou
the exposed ① Loss of follow up -
is inevitable

disease I
Stans & follow up
-


gets the
u


Types of cohort study p
exposed →
death , change of Address ,
Migration change of Occup
⑨ Prospective #Prospective cohort study
,


.




[concurrent] ③ exposure → study starts → event occurrence


%73.e.at?reE7iefntfifn.iuren#
.




µjµ+b
① study starts → exposure → Event occurrence .




Retrospective cohort study -




NIE C d Ctd
How to select comparison group ? ① Exposure → event occurrence → Study starts .


-




b -14
1) Internal comparison C> starts at C
zeynep}
disease
> light smoker .




*
only one cohort under study eg : smokers
-

Measure of Association
heavy smoker .
µ
+ sub classified travel



Incidenceratesof-outcome.is
back


) External comparison >
smoker .




I cohort for purpose of study + comparison
Ie=A
* .



Non smoker
-
.




3) comparison at general population .




zo=q
* If no comparison group + compare to general population .




①
prospective 1 Retrospective study .




Interpretation of RR Measure of Association
① Longitudinal Analytical Study .




RR=¥T=a
① Incidence study .




association ←
Rp = , → No


RR y l → t Association
Risk in Exp > Risk in NE .




RR C l → - Association
Risk in Exp a Risk in NE .
AR=Ie-IoJ