Considering the inclusion and non-inclusion criteria, 60 patients who wished to participate in the study (with written consent) were randomly substituted into three groups of 20 intervention (the group that received routine drug therapy and group intervention focused on intolerance of uncertainty), the first control (group receiving routine drug therapy and cognitive-behavioral group therapy as gold standard) and the second control (group receiving only routine drug therapy) were divided. The method of randomization was that first, codes were assigned to all three groups and then, by drawing lots, the order of the groups was determined as the intervention focused on intolerance of uncertainty, cognitive-behavioral therapy and waiting list. In the next step, the code was assigned to the sample people.
In one pot, 60 codes (20 codes for each group) and in another pot, 60 people were sampled. Then, randomly, a piece of paper was taken out of each pot, and based on the code that came out, the patient was placed in the group corresponding to the same code, until the codes were completed. Thus, 20 people were placed in each of the mentioned groups.