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Measuring cannabis consumption: Psychometric properties of the Daily Sessions, Frequency, Age of Onset, and Quantity of Cannabis Use Inventory (DFAQ-CU)

PloS one, 2017-05, Vol.12 (5), p.e0178194-e0178194 [Peer Reviewed Journal]

COPYRIGHT 2017 Public Library of Science ;COPYRIGHT 2017 Public Library of Science ;2017 Cuttler, Spradlin. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;2017 Cuttler, Spradlin 2017 Cuttler, Spradlin ;ISSN: 1932-6203 ;EISSN: 1932-6203 ;DOI: 10.1371/journal.pone.0178194 ;PMID: 28552942

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Title:
Measuring cannabis consumption: Psychometric properties of the Daily Sessions, Frequency, Age of Onset, and Quantity of Cannabis Use Inventory (DFAQ-CU)
Author: Cuttler, Carrie ; Spradlin, Alexander
Ito, Etsuro
Subjects: Abundance ; Addiction ; Addictions ; Adequacy ; Adult ; Age ; Alcohol ; Alcoholic beverages ; Analysis ; Bacon ; Biology and Life Sciences ; Cannabis ; Catchment areas ; Catchments ; Cognition ; College students ; Computers ; Copper ; Cross sections ; Data processing ; Drug abuse ; Drug addiction ; Eating ; Factor analysis ; Female ; Food ; Gender differences ; Hallucinogens ; Human behavior ; Humans ; Inventories ; Male ; Marijuana ; Marijuana Abuse - diagnosis ; Marijuana Smoking ; Mathematical analysis ; Matrices (mathematics) ; Measurement ; Measuring instruments ; Medicine and Health Sciences ; Mental disorders ; Mental health screening ; Methods ; Motivation ; Multivariate analysis ; Physical Sciences ; Polls & surveys ; Problems ; Properties (attributes) ; Psychiatry ; Psychological aspects ; Psychology ; Psychometrics ; Quantitative psychology ; Reliability analysis ; Research and Analysis Methods ; Residual effects ; Reviews ; Series (mathematics) ; Sex differences ; Smoking ; Social Sciences ; Sound ; Statistical analysis ; Statistical methods ; Statistical tests ; Structural reliability ; Studies ; Surveys ; Tobacco ; Validity ; Vaporizers ; Young Adult
Is Part Of: PloS one, 2017-05, Vol.12 (5), p.e0178194-e0178194
Description: We created the Daily Sessions, Frequency, Age of Onset, and Quantity of Cannabis Use Inventory (DFAQ-CU) because the current lack of psychometrically sound inventories for measuring these dimensions of cannabis use has impeded research on the effects of cannabis in humans. A sample of 2,062 cannabis users completed the DFAQ-CU and was used to assess the DFAQ-CU's factor structure and reliability. To assess validity, a subsample of 645 participants completed additional measures of cannabis dependence and problems (Marijuana Smoking History Questionnaire [MSHQ], Timeline Followback [TLFB], Cannabis Abuse Screening Test [CAST], Cannabis Use Disorders Identification Test Revised [CUDIT-R], Cannabis Use Problems Identification Test [CUPIT], and Alcohol Use Disorder Identification Test [AUDIT]). A six-factor structure was revealed, with factors measuring: daily sessions, frequency, age of onset, marijuana quantity, cannabis concentrate quantity, and edibles quantity. The factors were reliable, with Cronbach's alpha coefficients ranging from .69 (daily sessions) to .95 (frequency). Results further provided evidence for the factors' convergent (MSHQ, TLFB), predictive (CAST, CUDIT-R, CUPIT), and discriminant validity (AUDIT). The DFAQ-CU is the first psychometrically sound inventory for measuring frequency, age of onset, and quantity of cannabis use. It contains pictures of marijuana to facilitate the measurement of quantity of marijuana used, as well as questions to assess the use of different forms of cannabis (e.g., concentrates, edibles), methods of administering cannabis (e.g., joints, hand pipes, vaporizers), and typical THC levels. As such, the DFAQ-CU should help facilitate research on frequency, quantity, and age of onset of cannabis use.
Publisher: United States: Public Library of Science
Language: English
Identifier: ISSN: 1932-6203
EISSN: 1932-6203
DOI: 10.1371/journal.pone.0178194
PMID: 28552942
Source: GFMER Free Medical Journals
MEDLINE
PubMed Central
Public Library of Science (PLoS)
ProQuest Central
DOAJ Directory of Open Access Journals

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Measuring cannabis consumption: Psychometric properties of the Daily Sessions, Frequency, Age of Onset, and Quantity of Cannabis Use Inventory (DFAQ-CU)

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