why to know statistics

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Post on 28-May-2015

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  • 1. Why to know statistics

2.

  • To understand data

3. Example

  • One of your colleague is an oncology surgeon
  • 60% of his cases died
  • Does this mean that he is a looser!!

4.

  • We should ask what are the results of his colleagues insimilarpatients
  • How many patients he operated upon e.g 2/3!!!!

5.

  • To summarize data

6. Example

  • Diastolic Blood pressure
  • 80,70,65,90,74,80,60,90,60,75,80,90,100,100,100,95
  • Age
  • 24,30,26,40,28,21,26,31,32,36,27,45,62,58,52,50,60

7. Vital for research

  • Without the use of statistics it would be very difficult to make decisions based on the data collected from a research project

8. Statistical steps in research

  • Collect data
  • Organise data
  • Analyse data
  • Interpret the data
  • Present the data

9. How to read the results

  • An understanding of basic statistics will provide you with the fundamental skills necessary to read and evaluate results section in published papers

10. Are groups comparable!!!

  • the baseline characteristics of the groups being studied should be comparable
  • If not, they should be adjusted for differences

11. statistical tests

  • Are they frequently used tests!!
  • If not, why!!

12.

  • Are the data analysed according to the original protocol?

13.

  • Wasfollow- up complete?
  • Patients lost to follow-up loss of subjects bias
  • > 10% - 15 % ..invalid results

14. P value

  • A P value of