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| Research article summary (published 23 Jan 2003): |
Measuring seasonality: psychometric properties of the Seasonal Pattern Assessment Questionnaire and the Inventory for Seasonal Variation.
Full Abstract
There is a general consensus that seasonal changes in mood, behavior and vegetative functions vary in magnitude across the general population. Studying the dimension of seasonality requires reliable and valid measures. This study examined and compared the psychometric properties of the Seasonal Pattern Assessment Questionnaire (SPAQ) and the Inventory for Seasonal Variation (ISV) in 148 college students; 73 also completed a retest 2 months later. Results indicated good psychometric properties for both scales in terms of score distributions, test-retest reliability, internal consistency, factor structure and item-latent trait relationships using item response theory. Given the long history of its use and some small psychometric and simplicity advantages for the SPAQ, its continued use as a dimensional measure of seasonality is indicated.
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Author information
Author/s: Young, Michael A (MA); Blodgett, Christina (C); Reardon, Annemarie (A);
Affiliation: Institute of Psychology, Illinois Institute of Technology, 3101 S. Dearborn Avenue, Chicago 60616, USA. youngm(-atsign-)iit.edu
Journal and publication information
Publication Type: Journal Article
Journal: Psychiatry research (Psychiatry Res), published in Ireland. (Language: eng)
Reference: 2003-Jan; vol 117 (issue 1) : pp 75-83
Dates: Created 2003/02/12; Completed 2003/08/28; Revised 2008/04/17;
PMID: 12581822, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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