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Title: Relationship between item responses of negative affect items and the distribution of the sum of the item scores in the general population
Authors: Tomitaka, Shinichiro
Kawasaki, Yohei
Ide, Kazuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6377-1361 (unconfirmed)
Akutagawa, Maiko
Yamada, Hiroshi
Furukawa, Toshiaki A.
Ono, Yutaka
Author's alias: 古川, 壽亮
Issue Date: 2-Nov-2016
Publisher: Public Library of Science
Journal title: PLOS ONE
Volume: 11
Issue: 11
Thesis number: e0165928
Abstract: Background: Several studies have shown that total depressive symptom scores in the general population approximate an exponential pattern, except for the lower end of the distribution. The Center for Epidemiologic Studies Depression Scale (CES-D) consists of 20 items, each of which may take on four scores: "rarely, " "some, " "occasionally, " and "most of the time." Recently, we reported that the item responses for 16 negative affect items commonly exhibit exponential patterns, except for the level of "rarely, " leading us to hypothesize that the item responses at the level of "rarely" may be related to the non-exponential pattern typical of the lower end of the distribution. To verify this hypothesis, we investigated how the item responses contribute to the distribution of the sum of the item scores. Methods: Data collected from 21, 040 subjects who had completed the CES-D questionnaire as part of a Japanese national survey were analyzed. To assess the item responses of negative affect items, we used a parameter r, which denotes the ratio of "rarely" to "some" in each item response. The distributions of the sum of negative affect items in various combinations were analyzed using log-normal scales and curve fitting. Results: The sum of the item scores approximated an exponential pattern regardless of the combination of items, whereas, at the lower end of the distributions, there was a clear divergence between the actual data and the predicted exponential pattern. At the lower end of the distributions, the sum of the item scores with high values of r exhibited higher scores compared to those predicted from the exponential pattern, whereas the sum of the item scores with low values of r exhibited lower scores compared to those predicted. Conclusions: The distributional pattern of the sum of the item scores could be predicted from the item responses of such items.
Rights: © 2016 Tomitaka et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
URI: http://hdl.handle.net/2433/217400
DOI(Published Version): 10.1371/journal.pone.0165928
PubMed ID: 27806132
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