Development and Psychometric Evaluation of a 10-Item Short Form Inventory of Gambling Situations |
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Authors: | Caitlin Smith Sherry H Stewart Roisin M O’Connor Pamela Collins Joel Katz |
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Institution: | (1) Department of Psychology, Dalhousie University, Halifax, NS, B3H 4J1, Canada;(2) Department of Psychiatry, Dalhousie University, Halifax, NS, Canada;(3) Department of Psychology, Concordia University, Montreal, QC, Canada;(4) Department of Psychology, York University, Toronto, ON, Canada |
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Abstract: | The Inventory of Gambling Situations (IGS-63; Turner and Littman-Sharp, Inventory of gambling situations users guide, 2006) is a 63-item measure of high-risk gambling situations. It assesses gambling across 10 situational subscales that load onto
two higher-order factors: negative and positive situations (Stewart et al. Psychology of Addictive Behaviors, 22:257–268,
2008). While the IGS-63 has excellent psychometric properties (Littman-Sharp et al., The Inventory of Gambling Situations: Reliability,
factor structure, and validity (IGS Technical Manual), in press) its length may preclude its use in time-limited contexts. The purpose of this study was to develop and validate a 10-item
short-form of the IGS (IGS-10). Each IGS-10 item reflects one of the ten subscale categories from the IGS-63, with two items
from the original subscales included as examples for each IGS-10 item. The IGS-10 was administered to 180 undergraduate gamblers
along with the IGS-63 and the Problem Gambling Severity Index (PGSI; Ferris and Wynne, Canadian Problem Gambling Index: Final
report, 2001). IGS-10 items showed convergent validity with the corresponding IGS-63 subscales (r’s = .60–.73). Principal components analysis of the IGS-10 revealed two factors: negative (α = .84) and positive (α = .85).
PGSI scores correlated significantly with all IGS-10 items (r’s = .33–.58) and with both IGS-10 higher-order subscales (r’s = .66 negative] and .49 positive]), supporting the criterion validity of the IGS-10. Since minimal information is lost
when using the IGS-10, the short form may prove particularly useful when respondent burden prevents using the full IGS-63. |
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