To sample this study, a controlled clinical trial is performed by randomized multistage cluster sampling. According to the geographical map of Tehran, it is divided into three regions: north, center, and south. Tehran has 22 municipal districts, of which the north of Tehran includes 6 districts (1, 2, 3, 4, 5, and 22), the center of Tehran includes 10 districts (6, 7, 8, 9, 10, 11, 12, 13, 14 and 21) and the south of Tehran includes 6 districts (15, 16, 17, 18, 19 and 20). Using the index and rand functions of Excel software, two regions and a total of 6 municipal regions are selected randomly from each of these three regions of north, south, and center (stratified randomization).
The city of Tehran includes 354 active neighborhood houses, each of the 22 districts of Tehran includes a number of these neighborhood houses. After randomly selecting 6 regions, the number of subdirectories of each of these regions is determined separately and entered into Excel software. From among the neighborhoods of each region, 4 houses are randomly selected with Excel software. Eventually, we will have 24 neighborhood halls (clusters).
From the 4 houses selected in each area, 2 houses by simple randomization are assigned to intervention A and 2 houses to intervention B (control).
According to the sample size of 300 people in this study, about 15 elderly people from each of the 24 selected clusters (24 neighborhood halls) will participate. To select people in each neighborhood home, we act in such a way that we prepare a list of elderly people who are members of the neighborhood home and using Excel software, 15 people are randomly selected from them and they are contacted and asked for Participation in the study is invited. If several people do not attend the study, we randomly select alternative people from the same list