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Observational study (Case control studies (Timeframe of studies…
Observational study
Case control studies
Timeframe of studies
Retrospective study
Case control example
Results
Corresponding 2x2 table
Odds vs Risk
Odd Ratio
Odd ratio darab silang
1-OR
Rare Disease Assumption
When is the OR is a good approximation of the RR ?
Risk ratio
Case control studies advantages / limitations
Nested case- control stufies
Why use a nested case control study
15, cross sectional studies
Disadvantages
Methods
Cause and effects ?
Risk ratio
16, cohort studies
Time frame of Studies
The framingham Heart study
Measuring risks
Cohort study
Case control study
Advantages and disadvantages
6, type of studies
Observational
1, correlation study
Ii. Case reports and case series
Iii. Cross sectional survey
Iv. Case control study
V. Cohort studies
Experimental
1, community trials
Ii, clinical trials individual
7, study design
Experimental
RCT quasi
Observational
Analytical
Cross sectional
Cohort
Casencontrol
Descriptive
Case report
Case series
Surveys
11, descriptive studies
Who
What
Why
Where
Case report
Case series
Descriptive epidemiology study
Summary of statistical tests for contigency tables
Table size 2x2
R x C
Selecting a research design
1, level of knowledge
2, nature of the research phenomenon
3, nature of research purpose
4, ethical considerations
5, feasibility
6, validity and availability of data
7, precision
8, cost
5, types of Research from the view point of
Application
Objectives
Type of Information Sought
12, analytical studies
Basic question in Analytic Epidemiology
Look to link exposure and disease
Are exposure and disease linked
13, Analytical studies
Cohort study
Case control study
Cross sectional study
Types of Study design
How to choose a research design
4, Anatomy of Research
Observational vs Experimental study
Limitation of observational research Confounding
10, why observational studies ?
Scheme of cohort study
15, scheme of case control study