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I found a new use of a drug already in use. The results are as follows.

Serail No. of Patient-- Attacks while on Placebo-- Attacks while on drug --Difference in the no. of attacks

1- 23- 2- 21

2- 17- 1- 16

3- 13- 3- 10

4- 26- 0- 26

5- 16- 0- 16

6- 11- 1- 10

7- 22- 3- 19

8- 15- 1- 14

9- 19- 2- 17

10- 16- 1- 15

11- 22- 1- 21

12- 27- 0- 27

13- 31- 3- 28

14- 24- 2- 22

15- 22- 1- 21

16- 19- 2- 17

17- 16- 1- 15

18- 25- 3- 22

19- 19- 1- 18

20- 21- 2- 19

21- 6- 6- 0

22- 28- 3- 25

23- 19- 1- 18

24- 21- 2- 19

25- 27- 1- 26

26- 20- 1- 19

27- 17- 1- 16

28- 25- 1- 24

29- 18- 1- 17

30- 19- 1- 18

31- 5- 5- 0

32- 17- 1- 16

33- 28- 1- 27

34- 4- 4- 0

I am sorry I am not able to format the table correctly.

I have very basic knowledge of SPSS. Kindly advise how to go about.

DrWho
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    The question contains no question. Not sure what does "how to go about" entail. For crossover studies [paired analysis](http://www.cochrane-net.org/openlearning/html/modA2-3.htm) is a common solution. But if this is a human trial I would believe there should be already an analysis protocol. You better consult your team statistician. – Penguin_Knight May 14 '13 at 15:20
  • @Penguin_Knight: Thank you for your advice. Yes. You are right. This is a human trial of an in-use drug. I sought your help because we do not have a statistician. A few more words guiding the analysis from you would go a long way in helping millions of families. It is so difficult to get a knowledgeable statistician in developing countries. – DrWho May 15 '13 at 02:25

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