Limited randomization
Random allocation law, which is one of the limited randomization methods, was used for randomization. This method represents a large block for the entire volume. For this purpose, based on the sample size, which will be 40 people. 10 people were randomly assigned to group A, 10 people to group B, 10 people to group C, and 10 people to group D. Then groups A, B, C and D were placed in a lottery container and then randomly the balls were removed from the container without replacement and the created sequence was recorded.
Random tool
It included table and ball, lottery container, sealed opaque envelopes.
Block was the unit of individual randomization.
Extension of random assignment
In order to widen random allocation, sealed opaque envelopes with random sequence were used. In this method, based on the sample size of the research, a number of envelopes with aluminum wrappers (in order not to make the contents of the envelopes unclear) were prepared and each of the random sequences created was recorded on a card, and the cards inside the envelopes were in order were placed In order to preserve the random sequence, the outer surface of the envelopes is numbered. Finally, the lids of the envelopes are glued and placed in a box. At the time of registration of the eligible participants for the study, one of the envelopes was opened and the assigned group of that participant was revealed.
Implementation of random assignment process
In this section, the supervisor created a random sequence, the student checked the participants based on the criteria for entering and exiting the study and enrolled them in the study, and the advisor divided the participants into 4 groups.