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Impact of comorbidity on health-related quality of life: a population-based study using the Charlson Comorbidity Index and the new Health-Related Quality of Life Comorbidity Index, with data from the Swedish National Inpatient Register
Linköping University, Department of Social and Welfare Studies, Health, Activity, Care. Linköping University, Department of Medical and Health Sciences, Division of Preventive and Social Medicine and Public Health Science. Linköping University, Faculty of Health Sciences.
Public Health Centre, County Council of Östergötland, Linköping, Sweden.
Linköping University, Department of Medical and Health Sciences, Nursing Science. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Social and Welfare Studies, Health, Activity, Care. Linköping University, Faculty of Health Sciences.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Objectives: To investigate the impact of comorbidity on general health-related quality of life (HRQoL) in a Swedish normal population using the Charlson Comorbidity Index (CCI), designed for mortality outcomes, and the new Health-Related Quality of Life Comorbidity Index (HRQL-CI, with physical and psychosocial subindexes) designed for HRQoL outcomes, and comorbidity analyses based on data from the Swedish national inpatient register.

Study design and setting:L In 1999, 6083 women (54%) and men aged 20-74 (mean 46, SD 15) responded to a public health survey in the county of Östergötland, Sweden, including measures of general HRQoL (the SF-36 and the EQ-5D).

Results: During 1987-1999, 478 (15 %) and 664 (21 %)/418 (13 %) persons had been registered with ≥1 hospital admission ICD-code included in the CCI and the HRQL-CI physical/psychosocial dimensions, respectively. Both indices discriminated between persons with different degrees of comorbidity regarding their HRQoL. The HRQL-CI received somewhat higher R2 values (e.g. SF-36 scales Physical Functioning 0.161 vs 0.067 and Mental Health 0.026 vs 0.004).

Conclusions: The new HRQL-CI, created on the basis of self-reports, proved to be a valid measure of comorbidity in a Swedish normal population using national register data.

National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-75138OAI: oai:DiVA.org:liu-75138DiVA: diva2:503943
Available from: 2012-02-17 Created: 2012-02-17 Last updated: 2012-02-17Bibliographically approved
In thesis
1. Aspects of health-related quality of life: Associations with psychological and biological factors, and use as patient reported outcome in routine health care
Open this publication in new window or tab >>Aspects of health-related quality of life: Associations with psychological and biological factors, and use as patient reported outcome in routine health care
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background Health-related quality of life (HRQoL) is increasingly recognised as an important patient-reported outcome in health care research. However, the use is still restricted and several questions remain about the value and feasibility of using measures of HRQoL in routine health care. The general aims of the thesis were therefore to increase the understanding of these issues by studying 1) associations of HRQoL with psychological and biological factors, 2) comorbidity adjustments of HRQoL measurement results, and 3) the patient-perceived value and feasibility regarding the use of measures of HRQoL as patient-reported outcome in routine health care.

Methods Three different data sets were used; baseline data (questionnaire, anthropometric, and biological) from the ongoing Life conditions, Stress, and Health Study (n=1007, papers I and II), data from a population survey from the County Council of Östergötland in combination with data from two national Swedish registries, the National Inpatient Register and the Causes of Death Register (n=6086, paper III), and data (questionnaire) from the multicentre Swedish Health Promoting Hospitals Network Health outcome assessment project (n=463, paper IV). The HRQoL measures used were the SF-36 and the EQ-5D. Statistical methods include variance, correlation and regression analyses.

Results Psychological resources (Self-esteem, Sense of Coherence, and Perceived Control) as well as psychological risk factors (depressive mood) were found to relate independently to HRQoL (SF-36) in the expected directions (positive relations for resources and negative relations for risk factors), but with fewer sex differences than expected (Paper I). Low HRQoL (SF-36) was found to relate to higher levels of inflammatory biological factors (C-reactive protein, Interleukin-6, and MatrixMetalloProteinase-9), and, especially regarding Interleukin-6, many association remained significant, though attenuated, after adjustment for factors of known importance to HRQoL (age, sex, disease, lifestyle and psychological factors) (Paper II). A new comorbidity index, the Health-related Quality of Life Comorbidity Index (HRQL-CI), explicitly developed for use in HRQoL outcomes studies, showed higher explanatory power (higher R2 values) than the commonly used Charlson Comorbidity Index (CCI) regarding impact of comorbidity on HRQoL (SF-36 and EQ-5D). However, regarding mortality the CCI discriminated better between those who died within a year from answering the HRQoL questionnaires, died within ten years, or who were still alive after ten years. This result is in line with the CCI’s original purpose as a mortality predictor. Using morbidity data from mandatory, highly valid national health data bases was found to be useful in a large study of this kind, where using data from medical records might be impractical. (Paper III). Using measures of HRQoL as patient-reported outcome measures in routine health care was regarded as valuable by the majority of the patients in the Health outcome assessment project. A new concept was introduced, respondent satisfaction, and the respondent satisfaction summary score was in most cases equal, i.e. SF-36 and EQ-5D were found to be quite similar regarding the cognitive response process (understanding and responding to the items in the EQ-5D and the SF-36) and patient-perceived content validity (if EQ-5D and SF-36 gave patients the ability to describe their health in a comprehensive way) (Paper IV).

Conclusions The four papers investigated different aspects of HRQoL that are important for the implementation of the use of measures of HRQoL within the health care system. In conclusion, 1) the use of measures of HRQoL to identify patients with low HRQoL for further health promoting interventions might be supported on a psychological (psychological resources are related to better HRQoL) and biological basis (low HRQoL being an important sign of increased biological vulnerability), 2) a comorbidity index specifically aimed to adjust for comorbidity in patient HRQoL outcomes studies was found to be valid in a normal population (that might serve as a reference population in future studies), and 3) patients perceived the use of measures of HRQoL to be valuable and feasible in routine health care, and questionnaire length and ease of response were not found to be crucial arguments in the choice between SF-36 and EQ-5D. Hence, in their own way, they all and together, contribute to removing obstacles in the implementation process of using patient-reported outcome measures in the health care system for quality improvement.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 80 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1295
National Category
Other Medical Sciences not elsewhere specified
Identifiers
urn:nbn:se:liu:diva-74758 (URN)978-91-7519-958-0 (ISBN)
Public defence
2012-03-16, K2, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 13:00 (Swedish)
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Supervisors
Available from: 2012-02-07 Created: 2012-02-07 Last updated: 2012-03-23Bibliographically approved

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