Document Detail

Psychometric and comparative study of an Argentine version of the morningness composite and the early/late preference scales.
MedLine Citation:
PMID:  18293154     Owner:  NLM     Status:  MEDLINE    
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.
Esteban Gil; Pamela Lodi Abdo; Mariana Rodríguez; Laura Zanín; Miguel De Bortoli
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chronobiology international     Volume:  25     ISSN:  0742-0528     ISO Abbreviation:  Chronobiol. Int.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-02-22     Completed Date:  2008-05-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8501362     Medline TA:  Chronobiol Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  133-43     Citation Subset:  IM    
Faculty of Human Sciences, Department of Psychology, National University of San Luis, Argentina.
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MeSH Terms
Aging / physiology
Circadian Rhythm / physiology*
Middle Aged
Time Factors

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