# why to know statistics

Post on 28-May-2015

390 views

Embed Size (px)

TRANSCRIPT

- 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