Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/45100
Title: Psychometric properties of the composite scale of morningness: A shortened version
Authors: Pornpitakpan, C. 
Keywords: Chronobiology
Circadian rhythms
Human biological rhythms
Psychometrics
Test reliability
Thailand
Issue Date: 1998
Source: Pornpitakpan, C. (1998). Psychometric properties of the composite scale of morningness: A shortened version. Personality and Individual Differences 25 (4) : 699-709. ScholarBank@NUS Repository.
Abstract: The Composite Scale of Morningness published in Smith et al. (1989) was translated into Thai and tested on 321 Thai students to assess its cross-cultural applicability. The internal consistency (Cronbach's α = 0.79) of the full Thai Composite Scale of Morningness is comparable to that of the English scale. The shortened 7-item scale improves the full scale by deleting items that are redundant or have poor statistical properties. It retains high internal consistency (Cronbach's α = 0.70). Two components are extracted from the seven items: 'Voluntary Schedule' (items 2, 8, 10 and 11) and 'Alertness After Waking up/Self-Reported Morningness-Eveningness' (items 5, 12 and 9). The mean composite scores of morningness do not differ by gender. © 1998 Elsevier Science Ltd. All rights reserved.
Source Title: Personality and Individual Differences
URI: http://scholarbank.nus.edu.sg/handle/10635/45100
ISSN: 01918869
Appears in Collections:Staff Publications

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