Abstract
BackgroundThe European Quality of Life in Short Stature Youth (QoLISSY) is a novel condition-specific instrument developed to assess health related quality of life (HrQoL) in children/adolescents with short stature from patient and parent perspectives. Study objective was to linguistically validate and psychometrically test the American-English version of the QoLISSY instrument.MethodsUpon conversion of the British-English version to American-English, content validity and acceptance of the questionnaire were examined through focus group discussions with cognitive debriefing in 28 children/adolescents with growth hormone deficiency (GHD) or idiopathic short stature (ISS) and their parents. In the subsequent field test with 51 families and a re-test with 25 families the psychometric performance of the American-English version was examined and compared with the original European dataset.ResultsPilot test results supported the suitability of the American-English version. Good internal consistency with Cronbach’s Alpha ranging from 0.84 to 0.97 and high test-re-test reliabilities were observed in the field test. The QoLISSY was able to detect significant differences according to the degree of short stature with higher HrQoL for taller children. Correlations with a generic HrQoL tool support the QoLISSY’s concurrent validity. The scale’s operating characteristics were comparable to the original European data.ConclusionResults support that the QoLISSY American-English version is a psychometrically sound short stature-specific instrument to assess the patient- and parent- perceived impact of short stature. The QoLISSY instrument is fit for use in clinical studies and health services research in the American-English speaking population.
Highlights
Health-related Quality of Life (HrQoL) is an important multidimensional concept that is often measured in pediatric patients and instruments to measure this are increasingly being developed for that purpose
Referred children and adolescents diagnosed with growth hormone deficiency (GHD) or idiopathic short stature (ISS) and their parents were included in the study
The current study describes the adaptation of the Quality of Life in Short Stature Youth (QoLISSY) to American-English and examines its operating characteristics and psychometric properties
Summary
Health-related Quality of Life (HrQoL) is an important multidimensional concept that is often measured in pediatric patients and instruments to measure this are increasingly being developed for that purpose. [1] identified five pediatric condition-specific instruments available for use in children and adolescents with short stature. Bullinger et al Health and Quality of Life Outcomes (2015) 13:43 available for American-English speaking children and adolescents with short stature living in the US, it is necessary to examine the instrument both in terms of conceptual equivalence as well as psychometric performance. The European Quality of Life in Short Stature Youth (QoLISSY) is a novel condition-specific instrument developed to assess health related quality of life (HrQoL) in children/adolescents with short stature from patient and parent perspectives. Study objective was to linguistically validate and psychometrically test the AmericanEnglish version of the QoLISSY instrument
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