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Understanding the underestimation of self-report weight: The roles of narcissism and accountability

Menna Price Orcid Logo, Laura Douglas, Erica G. Hepper, Laura Wilkinson Orcid Logo

PLOS ONE, Volume: 19, Issue: 12, Start page: e0312691

Swansea University Authors: Menna Price Orcid Logo, Laura Wilkinson Orcid Logo

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Abstract

Self-reported height and weight is widely used to calculate Body Mass Index (BMI) and yet little is known about factors that affect accuracy. This study investigated the motivational characteristics–narcissism and social desirability—that influence the accuracy of self-reported weight and how they i...

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Published in: PLOS ONE
ISSN: 1932-6203
Published: Public Library of Science (PLoS) 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa67982
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spelling 2025-02-04T14:09:33.3682010 v2 67982 2024-10-14 Understanding the underestimation of self-report weight: The roles of narcissism and accountability e8d0f85a0d2762328c906c75b1d154b7 0000-0002-0025-0881 Menna Price Menna Price true false 07aeb47532af5a8421686d4f22f4a226 0000-0002-8093-0843 Laura Wilkinson Laura Wilkinson true false 2024-10-14 PSYS Self-reported height and weight is widely used to calculate Body Mass Index (BMI) and yet little is known about factors that affect accuracy. This study investigated the motivational characteristics–narcissism and social desirability—that influence the accuracy of self-reported weight and how they interact with accountability (telling participants that their weight will be verified). A two-way between-subjects design was used (accountable vs not accountable) with motivational moderators (narcissism and social desirability). Participants (N = 80; Mean Age = 34.63; 58.8% Female) were randomly allocated to accountable (told that their weight would be verified in a follow-up lab session) or not-accountable (no information given) conditions. In Session 1, participants self-reported motivational (social desirability and narcissism) and anthropometric (height and weight) measures online. In Session 2 (24 hours later), objective measures of height and weight were taken in the lab. There was a significant interaction between condition and maladaptive narcissism level. Being told that weight would be later verified improved accuracy of self-reported weight, but only for those low in maladaptive narcissism. Accountability improves the accuracy of self-report weight data, but not for individuals high in narcissism. Though based on a modest sample, these findings suggest that the under-estimation of self- report weight serves a self-protective function and maladaptive narcissism may be a useful covariate to include in research using self-report weight estimates. Journal Article PLOS ONE 19 12 e0312691 Public Library of Science (PLoS) 1932-6203 2 12 2024 2024-12-02 10.1371/journal.pone.0312691 COLLEGE NANME Psychology School COLLEGE CODE PSYS Swansea University SU Library paid the OA fee (TA Institutional Deal) Swansea University 2025-02-04T14:09:33.3682010 2024-10-14T13:16:09.0363411 Faculty of Medicine, Health and Life Sciences School of Psychology Menna Price 0000-0002-0025-0881 1 Laura Douglas 2 Erica G. Hepper 3 Laura Wilkinson 0000-0002-8093-0843 4 67982__33035__8495894fd6f64877a70ed528c3094521.pdf 67982.VOR.pdf 2024-12-03T13:12:42.4666084 Output 637138 application/pdf Version of Record true © 2024 Price et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0). true eng http://creativecommons.org/licenses/by/4.0/
title Understanding the underestimation of self-report weight: The roles of narcissism and accountability
spellingShingle Understanding the underestimation of self-report weight: The roles of narcissism and accountability
Menna Price
Laura Wilkinson
title_short Understanding the underestimation of self-report weight: The roles of narcissism and accountability
title_full Understanding the underestimation of self-report weight: The roles of narcissism and accountability
title_fullStr Understanding the underestimation of self-report weight: The roles of narcissism and accountability
title_full_unstemmed Understanding the underestimation of self-report weight: The roles of narcissism and accountability
title_sort Understanding the underestimation of self-report weight: The roles of narcissism and accountability
author_id_str_mv e8d0f85a0d2762328c906c75b1d154b7
07aeb47532af5a8421686d4f22f4a226
author_id_fullname_str_mv e8d0f85a0d2762328c906c75b1d154b7_***_Menna Price
07aeb47532af5a8421686d4f22f4a226_***_Laura Wilkinson
author Menna Price
Laura Wilkinson
author2 Menna Price
Laura Douglas
Erica G. Hepper
Laura Wilkinson
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container_start_page e0312691
publishDate 2024
institution Swansea University
issn 1932-6203
doi_str_mv 10.1371/journal.pone.0312691
publisher Public Library of Science (PLoS)
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hierarchy_top_title Faculty of Medicine, Health and Life Sciences
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hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str School of Psychology{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}School of Psychology
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description Self-reported height and weight is widely used to calculate Body Mass Index (BMI) and yet little is known about factors that affect accuracy. This study investigated the motivational characteristics–narcissism and social desirability—that influence the accuracy of self-reported weight and how they interact with accountability (telling participants that their weight will be verified). A two-way between-subjects design was used (accountable vs not accountable) with motivational moderators (narcissism and social desirability). Participants (N = 80; Mean Age = 34.63; 58.8% Female) were randomly allocated to accountable (told that their weight would be verified in a follow-up lab session) or not-accountable (no information given) conditions. In Session 1, participants self-reported motivational (social desirability and narcissism) and anthropometric (height and weight) measures online. In Session 2 (24 hours later), objective measures of height and weight were taken in the lab. There was a significant interaction between condition and maladaptive narcissism level. Being told that weight would be later verified improved accuracy of self-reported weight, but only for those low in maladaptive narcissism. Accountability improves the accuracy of self-report weight data, but not for individuals high in narcissism. Though based on a modest sample, these findings suggest that the under-estimation of self- report weight serves a self-protective function and maladaptive narcissism may be a useful covariate to include in research using self-report weight estimates.
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