Assignment of Alcoholic Beverages in the Munich Composite International Diagnostic Interview (M-CIDI): an Online Survey Among German Students and Non-students
The objective of this study is to investigate whether the materials presented during alcohol consumption assessment sufficiently aid interviewees in categorizing the beverages they consumed during their lifetime. In the cross-sectional “AF-CIDI” online survey, N = 162 adult drinkers (61% female, 40% non-students) aged 27 ± 8.2 years assigned beverages names to one of ten categories of the Munich Composite International Diagnostic Interview (M-CIDI) supplementary list. Eighty percent of these 4465 laymen beverage assignments were correctly classified in accordance with expert assignments. Assignment correctness was associated with confidence, and, to a smaller degree, exposure, prevalence, utility of examples, and age group. Alcohol by volume (ABV) estimates based on subjective classifications differed 2.7 points on average from CIDI-based ABVs, which in turn differed 3.6 points on average from real ABVs measured with Fourier transform infrared spectroscopy. Beverages with low lifetime prevalences (≤ 25%) were frequently misclassified. This understudied response bias might be part of the well-known underreporting phenomenon.
KeywordsAlcohol by volume Alcoholic beverages Beverage categorization Standardized assessment Subjective bias
We thank Torsten Tille for technical support and survey programming, Dr. Michael Höfler, Dominik Muhs, and Max Jakob for statistical support, as well as Anja Tritt and Lara Seefeld for help during recruitment and piloting. We owe thanks to Dr. Lars Pieper and Prof. Dr. Hans-Ulrich Wittchen for their supervision and their help to acquire funding and ethical approval.
SKP designed the study. SKP, FK, and PTK wrote the study protocol and created the measures and the beverage list. PTK was responsible for sampling and advertisement. SKP and CS prepared the dataset. DWL provided data on real ABVs. CS, LL, SKP, and JC conducted the analyses. SKP, DWL, JC, LL, and CS contributed to the interpretation of the results. SKP wrote the first draft of the manuscript. All authors critically revised and approved the finally submitted version of the manuscript.
This work was supported by the TU Dresden, Faculty of Psychology under Grant “Anschubfinanzierung” as of 19.09.2016. Analyses were partly supported by the Deutsche Forschungsgemeinschaft (DFG) Research group FOR1617 under grant WI 709/10-2, and the Technische Universität Dresden through a grant in the DAAD ipid4all program to SKP.
Compliance with Ethical Standards
All procedures were approved by the local ethics committee (EK450102016) and follow the Declaration of Helsinki and the recommendations for web-based surveys (Kramer et al. 2014). This study is registered as a clinical trial (ClinicalTrials.gov identifier NCT03097354).
Conflict of Interest
The authors declare that they have no conflicts of interest.
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