Wan Ling Lee1, Karuthan Chinna2, Awang Bulgiba2, Khatijah Lim Abdullah3, Imran Zainal Abidin4, Stefan Höfer5. 1. Department of Nursing Science, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia. wllee@um.edu.my. 2. Department of Social and Preventive Medicine, Faculty of Medicine, Julius Centre University of Malaya, University of Malaya, 50603, Kuala Lumpur, Malaysia. 3. Department of Nursing Science, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia. 4. Department of Medicine, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia. 5. Department of Medical Psychology, Innsbruck Medical University, Schöpfstr. 23a, 6020, Innsbruck, Austria.
Abstract
OBJECTIVES: Heart Quality of Life (HeartQoL) is a new "hybrid" developed from the MacNew and two condition-specific questionnaires measuring health-related quality of life (HRQoL) in patients with ischemic heart disease (IHD). This study investigates test-retest reliability of HeartQoL (English version) according to international criteria (e.g., COSMIN, GRRAS). Findings on HeartQoL are compared to the published data on MacNew in view that both serve as the core IHD-specific HRQoL instrument. METHODS: Out of 105 patients with IHD, 76 completed self-administration of HeartQoL at the clinic followed by at home within a 2-week interval. In retest, patients responded using non-interview methods (phone messaging, email, fax, and post). Phone interviewing was reserved for non-respondents to reminder. RESULTS: Reliability of HeartQoL was good (intraclass correlation coefficients = 0.78-0.82), was supported in the Bland-Altman plot, and was comparable to five studies on MacNew of similar retest interval (MacNew-English = 0.70-0.75; translated MacNew = 0.72-0.91). Applicability of its standard error of measurement (0.20-0.25) and smallest detectable change (0.55-0.70) will depend on availability of normative data in future. CONCLUSION: The reliability of HeartQoL is comparable to its parent instrument, the MacNew. The HeartQoL is a potentially reliable core IHD-specific HRQoL instrument in measuring group change.
OBJECTIVES: Heart Quality of Life (HeartQoL) is a new "hybrid" developed from the MacNew and two condition-specific questionnaires measuring health-related quality of life (HRQoL) in patients with ischemic heart disease (IHD). This study investigates test-retest reliability of HeartQoL (English version) according to international criteria (e.g., COSMIN, GRRAS). Findings on HeartQoL are compared to the published data on MacNew in view that both serve as the core IHD-specific HRQoL instrument. METHODS: Out of 105 patients with IHD, 76 completed self-administration of HeartQoL at the clinic followed by at home within a 2-week interval. In retest, patients responded using non-interview methods (phone messaging, email, fax, and post). Phone interviewing was reserved for non-respondents to reminder. RESULTS: Reliability of HeartQoL was good (intraclass correlation coefficients = 0.78-0.82), was supported in the Bland-Altman plot, and was comparable to five studies on MacNew of similar retest interval (MacNew-English = 0.70-0.75; translated MacNew = 0.72-0.91). Applicability of its standard error of measurement (0.20-0.25) and smallest detectable change (0.55-0.70) will depend on availability of normative data in future. CONCLUSION: The reliability of HeartQoL is comparable to its parent instrument, the MacNew. The HeartQoL is a potentially reliable core IHD-specific HRQoL instrument in measuring group change.
Authors: Lidwine B Mokkink; Caroline B Terwee; Donald L Patrick; Jordi Alonso; Paul W Stratford; Dirk L Knol; Lex M Bouter; Henrica C W de Vet Journal: Qual Life Res Date: 2010-02-19 Impact factor: 4.147