Scientific publications

Morningness–eveningness preference is commonly measured by questionnaires, such as the Composite Scale of Morningness (CSM). Purpose of our study was to assess the Russian translation of the CSM, and provide psychometric properties of this scale. Participants (N= 406) were students from high schools and university in Petrozavodsk. Mean age was 20.47 ± 3.66 with a range of 12-38 years. Mean CSM scores were 31.43 ± 6.32, with a range from 14 to 50. Internal reliability, as measured by Cronbach’s α, was 0.823. There was no negative correlation among the items. The reliability of 0.82 is good and fits into previous work done with the CSM in many different countries. The factor structure appears as a two-factor structure based on parallel analysis and a three-factor structure based on the Eigen-value greater than one criterion. We suggest retaining the two -factor structure, one factor could be labelled as morning affect and the other one as self-assessment/activity planning. Construct validity was checked with the MCTQ and showed that the correlations between midpoint of sleep and CSM are comparable to other studies.