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April 12, 2016; 86 (15) Article

Health-related quality of life in multiple sclerosis

Direct and indirect effects of comorbidity

Lindsay I. Berrigan, John D. Fisk, Scott B. Patten, Helen Tremlett, Christina Wolfson, Sharon Warren, Kirsten M. Fiest, Kyla A. McKay, Ruth Ann Marrie, For the CIHR Team in the Epidemiology and Impact of Comorbidity on Multiple Sclerosis (ECoMS)
First published March 9, 2016, DOI: https://doi.org/10.1212/WNL.0000000000002564
Lindsay I. Berrigan
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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John D. Fisk
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Scott B. Patten
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Helen Tremlett
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Christina Wolfson
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Sharon Warren
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Kirsten M. Fiest
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Kyla A. McKay
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Ruth Ann Marrie
From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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From the Department of Psychology (L.I.B.), St. Francis Xavier University, Antigonish; Department of Psychiatry (L.I.B., J.D.F.), Department of Medicine (J.D.F.), Dalhousie University, Halifax; Departments of Psychiatry and Community Health Sciences (S.B.P.), Cumming School of Medicine, University of Calgary; Division of Neurology, Faculty of Medicine (H.T., K.A.M.), University of British Columbia, Vancouver; Departments of Epidemiology & Biostatistics, Occupational Health, & Medicine (C.W.), McGill University, Montreal; Faculty of Rehabilitation Medicine (S.W.), University of Alberta, Edmonton; and Departments of Internal Medicine (K.M.F., R.A.M.) and Community Health Sciences (R.A.M.), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
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Citation
Health-related quality of life in multiple sclerosis
Direct and indirect effects of comorbidity
Lindsay I. Berrigan, John D. Fisk, Scott B. Patten, Helen Tremlett, Christina Wolfson, Sharon Warren, Kirsten M. Fiest, Kyla A. McKay, Ruth Ann Marrie, For the CIHR Team in the Epidemiology and Impact of Comorbidity on Multiple Sclerosis (ECoMS)
Neurology Apr 2016, 86 (15) 1417-1424; DOI: 10.1212/WNL.0000000000002564

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Abstract

Objective: To evaluate the direct and indirect influences of physical comorbidity, symptoms of depression and anxiety, fatigue, and disability on health-related quality of life (HRQoL) in persons with multiple sclerosis (MS).

Methods: A large (n = 949) sample of adults with MS was recruited from 4 Canadian MS clinics. HRQoL was assessed using the patient-reported Health Utilities Index Mark 3. Expanded Disability Status Scale scores, physical comorbidity, depression, anxiety, and fatigue were evaluated as predictors of HRQoL in a cross-sectional path analysis.

Results: All predictors were significantly associated with HRQoL and together accounted for a large proportion of variance (63%). Overall, disability status most strongly affected HRQoL (β = −0.52) but it was closely followed by depressive symptoms (β = −0.50). The direct associations of physical comorbidity and anxiety with HRQoL were small (β = −0.08 and −0.10, respectively), but these associations were stronger when indirect effects through other variables (depression, fatigue) were also considered (physical comorbidity: β = −0.20; anxiety: β = −0.34).

Conclusions: Increased disability, depression and anxiety symptoms, fatigue, and physical comorbidity are associated with decreased HRQoL in MS. Disability most strongly diminishes HRQoL and, thus, interventions that reduce disability are expected to yield the most substantial improvement in HRQoL. Yet, interventions targeting other factors amenable to change, particularly depression but also anxiety, fatigue, and physical comorbidities, may all result in meaningful improvements in HRQoL, as well. Our findings point to the importance of further research confirming the efficacy of such interventions.

GLOSSARY

CFI=
Comparative Fit Index;
CI=
confidence interval;
DSM-IV=
Diagnostic and Statistical Manual of Mental Disorders, 4th edition;
EDSS=
Expanded Disability Status Scale;
HADS=
Hospital Anxiety and Depression Scale;
HADS-A=
Hospital Anxiety and Depression Scale anxiety subscale;
HADS-D=
Hospital Anxiety and Depression Scale depression subscale;
HRQoL=
health-related quality of life;
HUI3=
Health Utilities Index Mark 3;
MS=
multiple sclerosis;
NARCOMS=
North American Research Committee on Multiple Sclerosis;
RMSEA=
root mean square error of approximation

Footnotes

  • Coinvestigators are listed on the Neurology® Web site at Neurology.org.

  • Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • Supplemental data at Neurology.org

  • Received May 27, 2015.
  • Accepted in final form January 5, 2016.
  • © 2016 American Academy of Neurology
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