Due to the nature of collaborative ergonomics that may be affected by the environment, it is not possible to select the test and control group from one hospital in order to carry out the study, therefore, for random allocation, one hospital will be randomly selected from among the selected hospitals through lottery. The intervention site and two other hospitals are selected as controls.
In the next step, after determining the hospital where the intervention will take place, first, the people who meet the criteria to enter the study are selected using the available method, and then 44 personnel are placed in the test group by simple random allocation and using a table of random numbers.
In the hospitals of the control group, after the identification of the hospitals, first, the people who meet the criteria for entering the study are selected using the available method, and then by simple random allocation and using a table of random numbers, 22 personnel from each hospital will be in the control group. Placed.
Finally, in order to compare the data, the number of selected people in each of the surgical fields in the test and control groups are selected in equal numbers.