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Multicenter Study
. 2007 Apr 30:5:23.
doi: 10.1186/1477-7525-5-23.

Development and multi-site validation of a new condition-specific quality of life measure for eating disorders

Carol E Adair  1 , Gisele C Marcoux, Brian S Cram, Carol J Ewashen, Janet Chafe, Stephanie E Cassin, Jorge Pinzon, Joanne L Gusella, Josie Geller, Yvette Scattolon, Patricia Fergusson, Lisa Styles, Krista E Brown
Affiliations
Multicenter Study

Development and multi-site validation of a new condition-specific quality of life measure for eating disorders

Carol E Adair et al. Health Qual Life Outcomes. .

Abstract

Background: In eating disorders (EDs) treatment, outcome measurement has traditionally focused on symptom reduction rather than functioning or quality of life (QoL). Generic QoL measures lack sensitivity for some diagnoses and many not be responsive in eating disorder patients. This article describes the development and validation of a condition-specific QoL measure for adolescents and adults with eating disorders--the Eating Disorders Quality of Life Scale (EDQLS).

Methods: Multi-source and multi-stage methods were used to develop the EDQLS, with participation of patients with EDs, their family members and ED treatment providers. Sources for domain and item development included 39 articles, 12 patient and 10 treatment provider interviews, and 31 first person narratives from the internet. Four stages of validation and pre-testing involving 17 patients, 10 family members and 18 providers reduced 233 items to 40 items in 12 domains. These items were pilot tested in 41 ED patients.

Results: The final instrument was then validated in a 12 site sample of 171 individuals aged 14-60 with EDs. All items showed good dispersion. The total raw mean score was 110 out of 200 (SD 27.6) with higher scores indicating better QoL. Internal consistency was excellent (Cronbach's alpha = .96) and subscale internal consistency ranged from alpha .36 to .79 providing evidence for a strong overall construct and some multi-dimensionality. Validity was supported by significant differences in mean EDQLS according to severity levels on the EDI-2 (F = 95.3, p <.001) and the BSI (F = 86.9, p <.001). EDQLS scores were positively associated with time in treatment (F = 4.65, p = .01) suggesting responsiveness. A strong positive association was also found between EDQLS scores and stage of change (F = 15.1 p <.001). Pearson's correlations between the EDQLS and criterion instrument scores were .71 for the SF-12 mental subscale, .61 for the QoLI and .78 for the 16D, supporting construct validity. Exploratory principal components and item response theory analyses identified only a few poor fitting items.

Conclusion: The EDQLS has promising psychometric characteristics and may be useful for evaluating ED treatment effectiveness.

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Figures

Figure 1
Figure 1
The EDQLS Development Process. * included nursing, dietetics, pediatrics, psychology, psychiatry, social work and family medicine; all with EDs clinical experience. ** Final domains: cognitive functioning, education/vocation, family and close relationships, relationships with others, future/outlook, appearance, leisure, psychological health, emotional health, values and beliefs, physical health and eating issues.
Figure 2
Figure 2
EDQLS Total Scale Scores by Time in Current Treatment Program.
Figure 3
Figure 3
EDQLS Total Scale Scores by Stage of Change Reported at Baseline.
See this image and copyright information in PMC

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