epidemiology and biostatistics (31505204) يويحلا ...€¦ · ... epidemiology for public...
TRANSCRIPT
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Faculty of Medicine Epidemiology and Biostatistics
واإلحصاء الحيوي الوبائيات (31505204)
Lecture 1 Course Introduction and Overview
Field work allocation
By
Hatim Jaber MD MPH JBCM PhD
4-6-2017
1
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Presentation outline 4-6-2017
Time
Introduction and Course Overview 10:20 to 10:30
Questionnaire as a tool of data collection. 10:30 to 10:40
Writing Scientific Research Paper 10: 40 to 10:50
How to write the report
10:50 to 11:00
How to collect data from the field.
11:00 to 11:10
2
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Epidemiology and Biostatistics (31505204)
• Course Title : Epidemiology and Biostatistics الوبائيات واإلحصاء الحيوي
• Credit Hours : 3 Credit Hours
• Calendar Description : 8 weeks/ Summer Semester - 2nd year
• Teaching Approaches : 4 (90 min) Lectures per week for 8 weeks and field work and report
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General course description:
• This course provides students with core skills in epidemiology and biostatistics. This course covers analytical and descriptive epidemiology, the epidemiology of infectious and chronic diseases; transmission of infectious diseases, descriptive statistics, the theory of probabilities, levels of significance, hypothesis testing, regression and correlation and the use of statistics in epidemiology.
Course General Objective:
• To teach students of how to apply their core skills in epidemiology and biostatistics in the field.
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• Method of Instruction : Lectures, practice and field work
• Evaluation and Grading : Two written exams (MCQ) plus one field work and report.
• The student’s course grade will be primarily determined by a combination of midterm examination, class participation and field work and project, multiple choice style final examination. The final examination will incorporate principles and materials from the required readings and from classroom discussions and lectures.
• Field work and report = 10% • Midterm Examination - (written) = 40%
• Final Examination (written) = 50%
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Recommended book
• Winner, L(2004). Introduction to Biostatistics. Florida: Department of Statistics; University of Florida. Daniel, W. (2005). Biostatistics: A foundation for analysis in the health sciences. New Jersey: New Jersey: John Wiley & Sons Inc.
• Textbook: Epidemiology for Public Health Practice, Robert H. Friis and Thomas A. Sellers. Fifth edition, 2013, Jones and Bartlett.
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# Lecture Title Lecture Objectives 1 Course Introduction and
Overview
Field work allocation
Introduction to course and field work : questionnaire as a tool of data collection. Understand how to collect data from the field. Understand how to write the report .
2 Definition of Biostatistics
Purposes of Biostatistics
Population and Sample
Types
Discuss and understand the importance and relations between health research , epidemiology and biostatistics.
Describe the role of the biostatisticians in biomedical research. Understand the basic statistical concepts and their application to healthcare research Describe the different types of samples and when to use it. Assess data sources and data quality for the purpose of
selecting appropriate data for specific research questions.
3 Descriptive statistics:
measures of variability.
Graphical display: looking
at data
Describe the different types of statistics: measures of variability. Apply numerical, tabular, and graphical descriptive techniques characterize and summarize public health data Evaluate computer output containing statistical procedures and graphics and interpret in a public health context
4
Practical Overview
of SPSS 1
Develop and understand the necessary computer skills using the SPSS in order to conduct basic statistical analyses Coding and entering data in SPSS Evaluate computer output containing statistical procedures and graphics and interpret in a public health context
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Exams
• Field work and report =10%
• Midterm Examination- (written) = 40%
•
• Final Examination (written) = 50%
• Submission date 20-7
• 29-6 or 2-7
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The report should includes:
• 1-Title • 2-Summary • 3-Introduction and Objectives • 5-Review of literature • 6-Methodology • 7-Results • 8-Discussion and conclusions • 9-Recommendations • 10-References. 10 minutes presentation for main groups
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) ( -
Q1: :
ال B ل ا Aوال و
Q2 : ( ......................................)
Q3 : ....
1 -30 2 -30 39
3 -40 49 4 -50 59
5 -60
Q4 : .......................... :1- – 2 -3
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Q6 .. 1 - 500 2 - 501- 1000 3 - 1001 - 2000 4 - 2000
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F3:
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H2 :
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H6
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W1
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W2
W3
W4
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..........
................ .............. .....................,
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• The Prevalence and Determinants of Chronic Non-Communicable Disease Risk Factors amongst Adults in the..
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4755539/ • https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3857959/ • /bmcpublichealth.biomedcentral.com/articles/10.1186/s12
889-015-1709-2 • https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3612413/ • ttp://medicine.chm.msu.edu/news/Prevalence%20of%20Di
abetes%20and%20Other%20Cardiovascular%20Risk%20Factors%20Among%20US%20Autoworkers.pdf
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General Guidelines
• Print or type using a 12 point standard font, such as Times, Geneva, Bookman, Helvetica, etc.
• Text should be double spaced on 8 1/2" x 11" paper with 1 inch margins, single sided
• Number pages consecutively (2-3 pages) • Start each new section on a new page • Adhere to recommended page limits
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Sections of a Scientific Research Paper
The first pages:
o Title page
o List of Contents …………………………..…..I
o List of Tables …………………………..........II
o List of Appendices …………………....…….IV
o List of Abbreviations ……………………….V
o Abstract ……………………..…………….……VI
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Sections of a Scientific Research Paper
1. Introduction
2. Methods
3. Results
4. Discussion
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• From the French word "recherche" which
means to travel through or survey
Origin of the Word “Research”
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Research Defined
Systematic investigation
into a problem or
situation, where the
intention is to identify
facts and/or opinions
that will assist in solving
the problem or dealing
with the situation
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How to do research
• Research is all about addressing an issue or asking and answering a question or solving a problem, so…
• Identify an issue, question, or problem.
Talk with people who want or need your study.
• Find out what's already known about it. Talk with experts and/or read their reviews and the original
research on the topic.
• Plan for research design and methodology
• Instrumentation, sampling
• Data analysis
• Conclusions, interpretations, recommendations
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Types of researches
observational or non-experimental
or descriptive
intervention or experimental
In an observational study…
The aim is to gather data or information about the world as it is.
So you hope the act of studying doesn't substantially modify the
thing you are interested in.
In an interventionist study…
You do something to the world and see what happens.
You gather data or information almost always before and after the
intervention, then look for changes.
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An observational study
– usually establishes only an association between
variables rather than a causal relationship;
– needs hundreds or even thousands of subjects for
accurate estimation of small effects.
– Types of observational study :
Case series
Cross-sectional
Case-control
Cohort
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An intervention study
• You can establish causality: X really does affect Y.
• Types of intervention :
– No control group (time series), e.g. measure performance in 10 athletes before and after a training intervention.
– Crossover, e.g. give 5 athletes a drug and another 5 athletes a placebo, measure performance; wait a while to wash out the treatments, then cross over the treatments and measure again.
• Ethically good, because all subjects get all treatments.
• But can't use if the effect of the treatment takes too long to wash out.
• Each subject can receive more than two treatments.
– Controlled trial, e.g. measure performance of 20 athletes before and after a drug and another 20 before and after a placebo.
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An intervention study………
• In interventions, bias is less likely if… – Subjects are randomly assigned to treatments. – Assignment is balanced in respect of any characteristics that
might affect the outcome. • In other words, you want treatment groups to be similar.
– Subjects and researchers are blind to the identity of the active and control (placebo) treatments.
• Single blind = subjects don't know which is which. • Double blind = the researchers administering the treatments
and doing the measurements and analysis don't know either.
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Research and Data Collection
• Research and data collection are not
synonymous. Data collection is:
– Part of the research PROCESS
– Provides answers to some of the questions
addressed by the research TOPIC
– Helps us to draw conclusions about the research
QUESTION(S) we have investigated
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Data …….
• Pieces of information obtained in a study
• Are the actual “values” of the study variables
Quantitative - numeric values
Qualitative - narrative descriptions
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Demands on data
• Relevance to the problem or situation at hand
• Must be available in a timely manner to the right person (manager or
decision-maker)
• Completeness
• Accuracy
• Accessibility
• Affordability
• Integrateability into a broader global information or decision-support
system
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Primary and Secondary Data Sources
• Primary
– Questionnaires
– Interviews
– Observation
– Participant observation
– Informal conversations
– Structured group discussions
• Secondary
– Textbooks
– Specialist books
– Journal papers
– Conference papers
– Magazine articles
– Government & industry reports
– Web pages
– Acts of Parliament
– Company reports
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Literature Reviews
The review of the literature is defined as a broad,
comprehensive, in-depth, systematic, and critical
review of scholarly publications, unpublished
scholarly print materials, audiovisual materials, and
personal communications
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Review of Literature
• This section consists of a thoughtful, balanced,
and critical evaluation of the research literature
that are highly relevant to the planned study in
such a way as:
- to address the gaps in existing knowledge
- to suggest the importance of the planned study
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Purposes of Literature Review
The overall purpose of literature review is to discover
knowledge
Research purposes of literature review:
1. Determines an appropriate research design/method
(instruments, data collection and analysis methods) for
answering the research question
2. Determines the need for replication of a well designed
study or refinement of a study
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Purposes of Literature Review……..
Non Research purposes of literature review:
1. Determines what is known about a subject,
concept or problem
2. Determines gaps, consistencies &
inconsistencies about a subject, concept or
problem
3. Discovers unanswered questions about a
subject, concept or problem
4. Describes strengths & weaknesses of designs,
methods of inquiry and instruments used in
earlier works
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Purposes of Literature Review
Non Research purposes of literature review:
5. Discovers conceptual traditions used to examine problems
6. Generates useful research questions or projects/activities for the discipline
7. Promotes development of protocols & policies related to nursing practice
8. Uncovers a new practice intervention, or gains support for changing a practice intervention
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Steps of Searching the Literature Review
Determine concept/issue/topic/problem
Conduct computer (and/or hand) search
Weed out irrelevant sources before printing
Organize sources from printout for retrieval
Retrieve relevant sources
Conduct preliminary reading and weed out irrelevant sources
Critically read each source (summarize & critique each source)
Synthesize critical summaries
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Literature Reviews
• Find out what is known about the subject
• Find out whether the research has been done before
• Build a case for carrying out research
• Show your expertise in the subject
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Literature Reviews: Field Work Projects
• Read a chapter of a well known textbook
• Note references
• Formulate some questions
• Use questions to direct further reading
• Jot down answers to questions
• Use answers to build an argument
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Literature Reviews: Development Projects
• Read general textbook to identify key concepts, authorities
• Carry out an author/subject search
• Read a number of books, papers and synthesise key points
• Write up what you have found out and explain how it relates to YOUR project
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Steps of research
– Select/define a problem
– Formulate research question/hypothesis
– Collect data
– Analyze data
– Report results
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!Plagiarism – Just Don’t Do ITاالن حال
• Plagiarism involves: – Intentionally copying someone else’s ideas or
words and not attributing them
– Colluding with other students on work when prohibited from doing so
– Cutting and pasting text from the Internet and passing it off as your own
– Purchasing someone else’s work and describing it as your own
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Introduction
• Definition of the problem under study.
• Magnitude of the problem.
• Major items concerning the problem, including the recent
studies trying to describe, explore its causes, solution of
the problem, etc.
• Rational of the research
- Does the study address an important health problem?
- How will scientific knowledge be advanced?
- What will be the effect of the study results on the concepts or methods
that drive this problem?