title: Test-retest reliability of HeartQoL and its comparability to the MacNew heart disease health-related quality of life questionnaire.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  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.affiliation: Department of Nursing Science, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia. wllee@um.edu.my.
authors.forename: Wan Ling
authors.identifier: http://orcid.org/0000-0002-5584-2905
authors.initials: WL
authors.lastname: Lee
authors.affiliation: Department of Social and Preventive Medicine, Faculty of Medicine, Julius Centre University of Malaya, University of Malaya, 50603, Kuala Lumpur, Malaysia.
authors.forename: Karuthan
authors.initials: K
authors.lastname: Chinna
authors.affiliation: Department of Social and Preventive Medicine, Faculty of Medicine, Julius Centre University of Malaya, University of Malaya, 50603, Kuala Lumpur, Malaysia.
authors.forename: Awang
authors.initials: A
authors.lastname: Bulgiba
authors.affiliation: Department of Nursing Science, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia.
authors.forename: Khatijah Lim
authors.initials: KL
authors.lastname: Abdullah
authors.affiliation: Department of Medicine, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia.
authors.forename: Imran Zainal
authors.initials: IZ
authors.lastname: Abidin
authors.affiliation: Department of Medical Psychology, Innsbruck Medical University, Schöpfstr. 23a, 6020, Innsbruck, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Höfer
mesh_terms: D000328:Adult; D000368:Aged; D000789:Angina, Unstable / Q000523:psychology; D003324:Coronary Artery Disease / Q000523:psychology* / Q000628:therapy; D005260:Female; D006304:Health Status; D006333:Heart Failure / Q000523:psychology; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000523:psychology; D010290:Parents; D011594:Psychometrics / Q000295:instrumentation*; D011788:Quality of Life / Q000523:psychology*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014175:Translating
keywords: Measurement agreement; Patient-reported outcome; Repeatability; Reproducibility; Validation