Block random assignment will be done in such a way that according to the number of study groups (three groups) consisting of intervention 1 (Cold spray), intervention 2 (Acupressure) and control and calculated based on the factorial law, i.e. 3!= 3×2×1= 6, all the possible arrangement modes of people will be compiled based on the table below, considering A for intervention group 1 (Cold spray), B for intervention group 2 (Acupressure) and C for control group:
1 2 3 4 5 6
CBA CAB BCA BAC ACB ABC
Then, since the estimated sample size was 123 people, in each block, three samples, each representative of a study group and their arrangement order was also different, from these blocks, placement sampling will be done. After the study objectives are fully explained, eligible research samples will be selected and, based on the time priority of referral, each of them will be assigned a code. By matching that number with the block random allocation list, the patients participating in the study will be assigned to one of the intervention 1 (Cold spray), intervention 2 (Acupressure), and control groups. This process will continue until the estimated sample size is completed.