title: Psychometric and comparative study of an Argentine version of the morningness composite and the early/late preference scales.
abstract: This study examined the psychometric properties of an Argentine Version of the Morningness Composite (CS) and the Early/Late Preference (PS) Scales. During summer (long photoperiod in Argentina), 304 subjects (69.1% women; mean age=33.64 yrs, SD=14 yrs) completed the scales for the first time. In winter (short photoperiod), 100 of the same individuals (71% women; mean age=37.17 yrs, SD=14.63 yrs) were retested. The total scores ranged within the values reported by previous studies and were independent of gender. Older subjects showed higher morningness scores. The internal consistencies were good (CS=0.86, PS=0.82). Item 7 from the CS and items 7 and 9 from the PS showed low item-scale correlation. Factor analysis produced a three-factor solution for both scales. However, the inconsistency of the evening items suggests that the single-solution may be more acceptable. Test-retest correlations were satisfactory (CS=0.88, PS=0.78), but the two-related-sample test revealed significant differences between test and retest scores, suggesting relative temporal stabilities. Both scales presented similar and acceptable psychometric properties and good correlation, indicating construct validity.
authors.affiliation: Faculty of Human Sciences, Department of Psychology, National University of San Luis, Argentina. estebang@unsl.edu.ar
authors.forename: Esteban
authors.initials: E
authors.lastname: Gil
authors.forename: Pamela Lodi
authors.initials: PL
authors.lastname: Abdo
authors.forename: Mariana
authors.initials: M
authors.lastname: Rodríguez
authors.forename: Laura
authors.initials: L
authors.lastname: Zanín
authors.forename: Miguel
authors.initials: M
authors.lastname: De Bortoli
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology; D001118:Argentina; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017440:Photoperiod; D011594:Psychometrics; D012621:Seasons; D013997:Time Factors