In order to use the 4.way random blocking method, one letter is assigned to each group (A: group by remote intervention method, B: control group). All possible modes for 4 blocks are written and numbered. Then, in a simple random method (using a table of random numbers), a number of numbers are selected from the block numbers and by writing the contents of those numbers (until the specified sample size is obtained ), The random allocation sequence is specified. For example, if the numbers obtained are 3, 2, 2, 1, etc., respectively, the assignment sequence will be as follows:
AABB ABAB ABAB BBAA
Then, in order to hide the allocation sequence, the sequence is written down on paper and placed in opaque sealed envelopes. Envelopes are numbered sequentially. Questionnaires are coded in the same way. In this case, a questionnaire with the same code will be completed for the person who receives the intervention code 1. The assignment sequence and its concealment will be done by someone outside the research team.