Abstract
BackgroundTo confirm the internal structure of the Health Related Quality of Life for Eating Disorders version 2 questionnaire (HeRQoLEDv2) and create and validate a shortened version (HeRQoLED-S).Methods324 patients with eating disorders were assessed at baseline and one year later (75.6% of whom responded). We performed a confirmatory factor analysis of the HeRQoLEDv2 using baseline data, and then a Rasch analysis to shorten the questionnaire. Data obtained at year one was used to confirm the structure of the HeRQoLED short form and evaluate its validity and reliability.ResultsTwo latent second-order factors -- social maladjustment and mental health and functionality -- fit the data for the HeRQoLEDv2. Rasch analysis was computed separately for the two latent second-order factors and shortened the HeRQoLEDv2 to 20 items. Infit and outfit indices were acceptable, with the confirmatory factor analysis of the HeRQoLED short form giving a root mean square error of approximation of 0.07, a non-normed fit index and a comparative fit index exceeding 0.90. The validity was also supported by the correlation with the convergent measures: the social maladjustment factor correlated 0.82 with the dieting concern factor of the Eating Attitudes Test-26 and the mental health and functionality factor correlated -0.69 with the mental summary component of the Short Form-12. Cronbach alphas exceeded 0.89.ConclusionsTwo main factors, social maladjustment and mental health and functionality, explain the majority of HeRQoLEDv2 scores. The shortened version maintains good psychometric properties, though it must be validated in independent samples.
Highlights
To confirm the internal structure of the Health Related Quality of Life for Eating Disorders version 2 questionnaire (HeRQoLEDv2) and create and validate a shortened version (HeRQoLED-S)
Since the earliest publications focusing on quality of life among individuals with an Eating disorders (ED) [1,2,3,4,5,6,7,8] it has been shown that they have a high degree of impairment in various areas of health-related quality of life (HRQoL)
For the DIF analysis, we examined whether diagnosis subtype may exert influence on item calibrations in subsamples
Summary
To confirm the internal structure of the Health Related Quality of Life for Eating Disorders version 2 questionnaire (HeRQoLEDv2) and create and validate a shortened version (HeRQoLED-S). Since the earliest publications focusing on quality of life among individuals with an ED [1,2,3,4,5,6,7,8] it has been shown that they have a high degree of impairment in various areas of health-related quality of life (HRQoL) Most of these early studies used generic tools to assess the impact of an ED on physical, mental, and social factors [9]. We developed one of these, the Health Related Quality of Life for Eating Disorders version 2 (HeRQoLEDv2) questionnaire [13,14], a tool with good validity and reliability One limitation of this 55question instrument is that it requires a considerable amount of time to complete. It does not require large samples sizes for adequate parameter estimation [19]
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