By simple sampling, the subjects referred to the two medical centers that are eligible, are randomly divided into intervention and control groups. In this study, the allocation of people to the two groups was done using the permutation block method
Became In this method A represents the person receiving the intervention and B represents the individual in the group
The control is. Considering the quadruple block; the AABB code 0 reversal, to ABAB's permutation
Code 1, to ABBA Code 2, to BAAB Code 3, to BBAA Code 4 and to BABA Code 5 to 9.
Then use the random number table to select the starting point randomly, followed by 21
Consider the number as a row or column.
Given the order of the table numbers, to any number
We hit the corresponding permutation for it, for example, if the first three numbers of the random number table
1, 0 and 5, respectively. The order of receiving treatment by the first 12 people in two groups, respectively, was from left to
Right ABABAABBBABA will be. So finally choose 21 of the table of the way
Allocation of a total of 84 people will be identified in two groups