The validation of the Persian version of the Revised Mood Rhythm instrument (MRhI)

The research aimed to validate the Iranian version of the mood rhythm. The statistical population was all the students of Urmia University in 2022. The sample size in the present study was 340 people and they were selected by multi-stage cluster sampling method. In this way, 10 faculties were randomly selected among the faculties of Urmia universities. Then, 34 students were randomly selected from each faculty and completed the Revised Mood Rhythm Instrument (MRhI; De Oliveira et al., 2021 The analysis method of this research was factor analysis. Investigating construct validity using confirmatory factor analysis showed that the scale has a three-factor structure including cognitive, physical, and emotional. It has favorable fit indices (CFI=0.926, GFI=0.919, RMSEA=0.061, p < 0.001) for reliability using Koder Richardson's method for physical factor 0.79, cognitive factor 0.76, the emotional factor was 0.73 and the total number of questions was 0.82 (p < 0.001), which indicates the acceptable reliability of the mood rhythm instrument. Based on the findings of this research, it can be concluded that this instrument has adequate validity and reliability in Iranian society and can be used to measure and screen circadian cycle disorders and for research and treatment purposes.