Document Detail

Investigation of age and gender effects on positive orientation in Italian twins.
MedLine Citation:
PMID:  25355668     Owner:  NLM     Status:  In-Data-Review    
We investigated age and gender effects on "Positive Orientation" (POS)-an individual's tendency to view life with a positive outlook-using a genetically informed design. Study subjects were 1016 twins aged 22-75 from the Italian twin registry. We assessed POS by the recently developed P-scale. First, we used confirmatory factor analysis to investigate scale's measurement invariance by age and gender. Then, we applied biometric modelling to estimate genetic and environmental components of POS score. Overall, we found a satisfactory degree of measurement invariance by both age and gender. Results from these analyses further indicated an increasing mean level of POS across the lifespan. Additive genetic and unshared environmental factors explained respectively 58% and 42% of variance in POS score, with no significant gender differences; furthermore, the pattern of change of gene-environment architecture of POS over time was consistent with a greater plasticity of personality at older ages.
Corrado Fagnani; Emanuela Medda; Maria A Stazi; Gian V Caprara; Guido Alessandri
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Publication Detail:
Type:  Journal Article     Date:  2014-03-19
Journal Detail:
Title:  International journal of psychology : Journal international de psychologie     Volume:  49     ISSN:  1464-066X     ISO Abbreviation:  Int J Psychol     Publication Date:  2014 Dec 
Date Detail:
Created Date:  2014-10-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0107305     Medline TA:  Int J Psychol     Country:  England    
Other Details:
Languages:  eng     Pagination:  453-61     Citation Subset:  IM    
Copyright Information:
© 2014 International Union of Psychological Science.
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