title: The composite scale of morningness: further psychometric properties and temporal stability.
abstract: OBJECTIVE
  To assess the temporal stability of the French version of the Composite Scale of Morningness (CSM), and to replicate our previous findings in an independent sample in order to confirm the good internal properties of this instrument.
  
  
  METHODS
  Sixty nursing students (11 males and 49 females) filled out the Composite Scale of Morningness on two occasions over a 13-month period.
  
  
  RESULTS
  The scale's reliability is high: Cronbach's alpha = 0.874 in males and 0.904 in females. The CSM total scores are normally distributed and independent of gender. They do not differ between occasions, and are highly correlated: r = +0.885 in males and r = +0.930 in females.
  
  
  CONCLUSIONS
  The French version of the CSM is stable over time and psychometrically reliable. These are the characteristics of a personality trait. Further studies should explore its personality, biological and genetic correlates.
authors.affiliation: CHU de Nice, Hôpital de l'Archet II, 151 route de Saint Antoine Ginestiere, BP 3079, 06202 Nice cedex 3, France.
authors.forename: H
authors.initials: H
authors.lastname: Caci
authors.forename: L
authors.initials: L
authors.lastname: Nadalet
authors.forename: P
authors.initials: P
authors.lastname: Staccini
authors.forename: M
authors.initials: M
authors.lastname: Myquel
authors.forename: P
authors.initials: P
authors.lastname: Boyer
mesh_terms: D002940:Circadian Rhythm; D005260:Female; D005602:France; D006801:Humans; D008297:Male; D010551:Personality; D011594:Psychometrics / Q000379:methods*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires