Psychometric Evaluation of the German Version of the Impact of Weight on Quality of Life-Lite (IWQOL-Lite) Questionnaire

Mueller, Andréas; Holzapfel, Christian; Hauner, Hans; Crosby, Ross D.; Engel, Scott G.; Mühlhans, Barbara; Kolotkin, Ronette L.; Mitchell, Jan; Horbach, T.; Zwaan, Martina de

doi:10.1055/s-0030-1261922

Cited by 31 publications

(31 citation statements)

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“…In the present study, the relationship found between the IWQOL-Lite and measures of psychopathology and self-perception supports the construct validity of the instrument. This is again consistent with previous studies, in which the IWQOL-Lite was significantly inversely correlated with other measures of psychopathology [13,15]. The analysis of the relationship between the IWQOL-Lite and self-perception items is also consistent with the findings of Masheb et al [37], who found self-esteem and body dissatisfaction to be more impaired in severely obese patients awaiting bariatric surgery.…”

Section: Discussionsupporting

confidence: 91%

“…The IWQOL-Lite scores obtained were slightly higher than those of a sample of North American bariatric surgery patients [25]. Similarly, these Spanish patients scored slightly higher on physical function, self-esteem, and work and had higher total transformed scores, than did the severely obese patients studied in the German validation [13] of the IWQOL-Lite (A. Mueller, personal communication). By contrast, the present study found lower quality of life in the sexual life and public distress domains compared with the German data, as well as in comparison to clinical and community samples from Brazil and Portugal [12,18].…”

Section: Discussionmentioning

confidence: 91%

“…Scores for each subscale and a total score are obtained. Previous studies have reported adequate corrected item-total correlations and internal consistency coefficients in bariatric surgery patients, as well as in a variety of clinical and community samples [12,13,[15][16][17][18]25]. Factor analysis has also supported the construct validity of the questionnaire [15][16][17][18].…”

Section: Quality Of Lifementioning

confidence: 92%

“…Although generic HRQOL assessment instruments are available, the use of obesity-specific assessment tools is recommended, since they are capable of assessing particular aspects of quality of life [12]. Disorder-specific questionnaires contain items of particular relevance to a certain disease and, therefore, are better able to detect improvement or deterioration in specific aspects related to it [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Faced with the need for a brief and obesity-specific tool to assess HRQOL in the clinical setting, the IWQOLLite, a reduced version of the former, was subsequently developed [15]. To date, the IWQOL-Lite has demonstrated adequate psychometric properties in a variety of populations and settings [15][16][17], and it has also been validated and adapted for use in Portuguese [18], Brazilian Portuguese [12], and German [13] samples. The factor analysis of the IWQOL-Lite confirmed the existence of five domains and a total score that were related to HRQOL in obesity.…”

Section: Introductionmentioning

confidence: 99%

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Psychometric Evaluation of the IWQOL-Lite (Spanish Version) When Applied to a Sample of Obese Patients Awaiting Bariatric Surgery

et al. 2011

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Background Obesity may have an impact on key aspects of health-related quality of life (HRQOL). In this context, the Impact of Weight Quality of Life (IWQOL) questionnaire was the first scale designed to assess HRQOL. The aim of the present study was twofold: to assess HRQOL in a sample of Spanish patients awaiting bariatric surgery and to determine the psychometric properties of the IWQOL-Lite and its sensitivity to detect differences in HRQOL across groups. Methods Participants were 109 obese adult patients (BMI≥ 35 kg/m 2 ) from Barcelona, to whom the following measurement instruments were applied: IWQOL-Lite, Depression Anxiety Stress Scales, Brief Symptom Inventory, and self-perception items.Results Descriptive data regarding the IWQOL-Lite scores obtained by these patients are reported. Principal components analysis revealed a five-factor model accounting for 72.05% of the total variance, with factor loadings being adequate for all items. Corrected item-total correlations were acceptable for all items. Cronbach's alpha coefficients were excellent both for the subscales (0.88-0.93) and the total scale (0.95). The relationship between the IWQOLLite and other variables supports the construct validity of the scale. Finally, sensitivity analysis revealed large effect sizes when comparing scores obtained by extreme BMI groups. Conclusions This is the first study to report the application of the IWQOL-Lite to a sample of Spanish patients awaiting bariatric surgery and to confirm that the Spanish version of the instrument has adequate psychometric properties.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 91%

Section: Quality Of Lifementioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Psychometric Evaluation of the IWQOL-Lite (Spanish Version) When Applied to a Sample of Obese Patients Awaiting Bariatric Surgery

et al. 2011

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Nonnormative Eating Behaviors and Eating Disorders and Their Associations With Weight Loss and Quality of Life During 6 Years Following Obesity Surgery

et al. 2022

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ImportanceIndividuals with severe obesity presenting for obesity surgery (OS) frequently show nonnormative eating behaviors (NEBs) and eating disorders (EDs), but the long-term course and prospective associations with weight loss and health-related quality of life (HRQOL) remain unclear.ObjectiveTo examine the prevalence and prospective relevance of presurgical and postsurgical NEBs and EDs according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, diagnosed through clinical interview, for weight loss and HRQOL up to 6 years following OS.Design, Setting, and ParticipantsIn the prospective, multicenter Psychosocial Registry for Obesity Surgery cohort study, patients seeking OS were recruited at 6 OS centers in Germany and assessed at baseline before surgery and at 6 months and 1 to 6 years after surgery. From a consecutive sample of 1040 volunteers with planned OS from March 1, 2012, to December 31, 2020, a total of 748 (71.92%) were included in this study. Across follow-up, 93 of the 748 patients (12.43%) dropped out. Data were analyzed from April to November 2021.InterventionsLaparoscopic Roux-en-Y gastric bypass or sleeve gastrectomy.Main Outcomes and MeasuresBoth NEBs and EDs were identified using the Eating Disorder Examination interview. Main outcomes were the percentage of total body weight loss (%TBWL) and HRQOL (Impact of Weight on Quality of Life-Lite; range, 0-100, with 0 indicating worst and 100 indicating best).ResultsIn 748 patients undergoing OS (mean [SD] age, 46.26 [11.44] years; mean [SD] body mass index [calculated as weight in kilograms divided by height in meters squared], 48.38 [8.09]; 513 [68.58%] female), the mean (SD) %TBWL was 26.70% (9.61%), and the mean (SD) HRQOL improvement was 35.41 (20.63) percentage points across follow-up. Both NEBs and EDs were common before surgery, with postsurgical improvements of varying degrees. Whereas NEBs and EDs did not reveal significant prospective associations with %TBWL, loss-of-control eating at follow-up was concurrently associated with lower %TBWL (estimate, −0.09; 95% CI, −0.14 to −0.04). Loss-of-control eating (estimate, −0.10; 95% CI, −0.17 to −0.03 percentage points) and binge-eating disorder of low frequency and/or limited duration (estimate, −6.51; 95% CI, −12.69 to −0.34 percentage points) at follow-up showed significant prospective associations with lower HRQOL.Conclusions and RelevanceThis cohort study found prospective relevance of loss-of-control eating and binge-eating disorder of low frequency and/or limited duration for reduced long-term HRQOL following OS. These findings underline the importance of monitoring both NEBs, especially loss-of-control eating, and EDs in the long term postsurgically to identify patients in need of targeted prevention or psychotherapy.

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Effect of Internet-Based Guided Self-help vs Individual Face-to-Face Treatment on Full or Subsyndromal Binge Eating Disorder in Overweight or Obese Patients

Zwaan

Herpertz

Zipfel³

et al. 2017

JAMA Psychiatry

125

114

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Psychometric Evaluation of the German Version of the Impact of Weight on Quality of Life-Lite (IWQOL-Lite) Questionnaire

Abstract: The results of the present study suggest that the German IWQOL-Lite is a psychometrically validated instrument with which to measure weight-specific health related quality of life.

Cited by 31 publications

References 7 publications

Psychometric Evaluation of the IWQOL-Lite (Spanish Version) When Applied to a Sample of Obese Patients Awaiting Bariatric Surgery

Psychometric Evaluation of the IWQOL-Lite (Spanish Version) When Applied to a Sample of Obese Patients Awaiting Bariatric Surgery

Nonnormative Eating Behaviors and Eating Disorders and Their Associations With Weight Loss and Quality of Life During 6 Years Following Obesity Surgery

Effect of Internet-Based Guided Self-help vs Individual Face-to-Face Treatment on Full or Subsyndromal Binge Eating Disorder in Overweight or Obese Patients

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