The present research is a two-group clinical trial with a pretest-posttest and one-month follow-up design. One hundred elderly people consulting two of the largest health centers affiliated to Shiraz University of Medical Sciences (Shahid Motahari and Imam Reza Multi-Specialty Clinics) participated in this study. The study was conducted over the course of May 2019 to Aguste 20 20, in Shiraz, Iran. The current research was registered in the Iranian clinical trials registry (code: IRCT20190506043498N1).
Considering α = 0.05, a power of 90%, and an effect size (the intensity of the association between two variables) of 0.7 according to data provided by Abbasi et al. (
15) and Ghezeljeh et al. (
16), the sample size was determined to be 86 people, which was rounded up to 100 to take a 16% drop rate into account (50 people were allocated to the control group and 50 were allocated to the intervention group). Samples were chosen in stages. In the first, we identified two health centers (Shahid Motahari and Imam Reza Clinic) through a simple random sampling procedure. Afterward, 100 elderly people who were referred to the elderly clinic and family physician (FP) of these clinics for routine follow-up were enrolled in the study. However, seven subjects did not meet the inclusion criteria, and three-person refused to take part in the study. Finally, 90 subjects, who were recruited to the study using the convenience sampling method, were randomly divided into the intervention (n = 45) and control (n = 45) groups. Assigning individuals to the groups was carried out through block randomization method with Block size 4. With two groups of control (C) and intervention (T), six possible equilibrium combinations were calculated (TTCC, TCTC, TCCT, CTTC, CTCT, CCTT), and blocks were randomly selected to determine the allocation of all 90 individuals to the groups. This process was repeated until all the samples were included, and the sampling sequence was recorded in sample table. According to this table, all of the participants were divided into the groups. It should be noted that during the training sessions and follow-up time, none of the participants were excluded from the study (
Figure 1). The participants were unaware of the randomization process and the group they belonged to during the study, making the study single-blinded. The inclusion criteria were being at least 60 years old, a history of falling, willingness to participate, and awareness of the time, place, and person. Exclusion criteria were a history of participation in similar studies, absence over two sessions or death, and incomplete answers to the questionnaire.