Quality and acceptability of patient-reported outcome measures used in chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME): a systematic review
- 863 Downloads
- 39 Citations
Abstract
Purpose
To review the quality and acceptability of condition-specific, domain-specific and generic multi-item patient-reported outcome measures (PROMs) used in the assessment of adults with chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME).
Methods
Systematic literature searches were made to identify PROMs. Quality and acceptability was assessed against an appraisal framework, which captured evidence of both the thoroughness and results of evaluations: evidence of measurement (reliability, validity, responsiveness, interpretability, data quality/precision) and practical properties (feasibility, patient acceptability), and the extent of active patient involvement was sought.
Results
A total of 11 CFS/ME-specific, 55 domain-specific and 11 generic measures were reviewed. With the exception of the generic SF-36, all measures had mostly limited evidence of measurement and/or practical properties. Patient involvement was poorly reported and often cursory.
Conclusions
The quality and acceptability of reviewed PROMs is limited, and recommendations for patient-reported assessment are difficult. Significant methodological and quality issues in PROM development/evaluation were identified by the appraisal framework, which must be addressed in future research. Clear discrepancies exist between what is measured in research and how patients define their experience of CFS/ME. Future PROM development/evaluation must seek to involve patients more collaboratively to measure outcomes of importance using relevant and credible methods of assessment.
Keywords
Chronic fatigue syndrome/myalgic encephalomyelitis Patient-reported outcome ReviewAbbreviations
- CFS/ME
Chronic fatigue syndrome/myalgic encephalomyelitis
- PROMs
Patient-reported outcome measures
Notes
Acknowledgements
The authors would like to thank Jacoby Peterson (JP) for her contribution to the data extraction. GUS Charitable Trust to support research associated with the PRIME initiative (Partnership for Research in ME/CFS http://prime-cfs.org/).
Conflict of interest
None.
Supplementary material
References
- 1.Department of Health. (2002). Report of the CFS/ME working group. Para.1.4.2, p6. Accessed 2 March 2009 http://www.dh.gov.uk/en/Publicationsandstatistics/Publications/PublicationsPolicyAndGuidance/DH_4064840.
- 2.Bibby, J., & Kershaw, A. (2006). How much is M.E. costing the country? Report prepared by the survey & Statistical Research Centre. Sheffield, England: Sheffield Hallam University.Google Scholar
- 3.Reynolds, K. J., Vernon, S. D., Bouchery, E., & Reeves, W. C. (2004). The economic impact of chronic fatigue syndrome. Cost Effectiveness and Resource Allocation, 2(1), 4.PubMedCrossRefGoogle Scholar
- 4.Liberating the NHS: legislative framework and next steps. (2010). UK Department of Health. Accessed 4 April 2011. http://www.dh.gov.uk/prod_consum_dh/groups/dh_digitalassets/@dh/@en/@ps/documents/digitalasset/dh_122707.pdf.
- 5.Staley, K. (2009). Exploring impact: Public involvement in NHS, public health and social care research. Eastleigh: INVOLVE. Accessed 4 April 2011. http://www.invo.org.uk/pdfs/Involve_Exploring_Impactfinal28.10.09.pdf.
- 6.Staniszewska, S., Crowe, S., Badenoch, D., Edwards, C., Savage, J., & Norman, W. (2010). The PRIME project: Developing a patient evidence-base. Health Expectations, 3, 312–322.Google Scholar
- 7.Guyatt, G. H., Ferrans, C. E., Halyard, M. Y., et al. (2007). Clinical significance consensus meeting group. Exploration of the value of health-related quality-of-life information from clinical research and into clinical practice. Mayo Clinic Proceedings, 10, 1229–1239.CrossRefGoogle Scholar
- 8.Fitzpatrick, R., Davey, C., Buxton, M. J., & Jones, D. R. (1998). Evaluating patient-based outcome measures for use in clinical trials. Health Technology Assessment, 2(14).Google Scholar
- 9.Staniszewska, S., Jones, N., Newburn, M., & Marshall, S. (2007). User involvement in the development of a research bid: Benefits, barriers and enablers. Health Expectations, 10(2), 173–183.PubMedCrossRefGoogle Scholar
- 10.Garratt, A., Schmidt, L., Mackintosh, A., & Fitzpatrick, R. (2002). Quality of life measurement: Bibliographic study of patient assessed health outcome measures. British Medical Journal, 324(7351), 1417.PubMedCrossRefGoogle Scholar
- 11.Mokkink, L. B., Terwee, C. B., Stratford, P. W., et al. (2009). Evaluation of the methodological quality of systematic reviews of health status measurement instruments. Quality of Life Research, 18, 313–333.PubMedCrossRefGoogle Scholar
- 12.Haywood, K. L., Garratt, A. M., & Fitzpatrick, R. (2005). Quality of life in older people: A structured review of generic self-assessed health instruments. Quality of Life Research, 7, 1651–1668.CrossRefGoogle Scholar
- 13.Nunnally, J. C., & Bernstein, I. H. (1994). Psychometric theory. Third edition. McGraw-Hill Series in Psychology. New York: McGraw-Hill Inc.Google Scholar
- 14.Scientific Advisory Committee of the Medical Outcomes Trust. (2002). Assessing health status and quality of life instruments: Attributes and review criteria. Quality of Life Research, 11, 193–205.CrossRefGoogle Scholar
- 15.Streiner, D. L., & Norman, G. R. (2008). Health Measurement Scales. A practical guide to their development and use (4th ed.). Oxford: Oxford Medical Publications Inc.Google Scholar
- 16.McDowell, I. (2006). Measuring health: A guide to rating scales and questionnaires (3rd ed.). New York: Oxford University Press.Google Scholar
- 17.US Department of Health and Human Services Food and Drug Administration. (2009). Guidance for industry. Patient-reported outcome measures: Use in medical product development to support labelling claims. Accessed 4 April 2011. http://www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/UCM193282.pdf.
- 18.Terwee, C. B., Bot, S. D. M., de Boer, M. R., van der Windt, D. A. W. M., Knol, D. L., Dekker, J., et al. (2007). Quality criteria were proposed for measurement properties of health status questionnaires. Journal of Clinical Epidemiology, 60, 34–42.PubMedCrossRefGoogle Scholar
- 19.Valderas, J. M., Ferrer, M., Mendivil, J., et al. (2008). Development of EMPRO: A tool for the standardised assessment of patient-reported outcome measures. Value in Health, 11(4), 700–708.PubMedCrossRefGoogle Scholar
- 20.Garratt, A. M., Brealey, S., Gillespie, W. J., & DAMASK Trial Team. (2004). Patient-assessed health instruments for the knee: A structured review. Rheumatology (Oxford), 43(11), 1414–1423.CrossRefGoogle Scholar
- 21.Smith, S., Cano, S., Lamping, D., et al. (2005). Patient-reported outcome measures (PROMs) for routine use in treatment centres: recommendations based on a review of the scientific evidence. Final report to the Department of Health. Accessed 4 April 2011. http://www.wmqi.westmidlands.nhs.uk/downloads/file/PROMS%20Final%20report%20Dec%2005.pdf.
- 22.Boote, J., Telford, R., & Cooper, C. (2002). Consumer involvement in health research: A review and research agenda. Health Policy, 61, 213–236.PubMedCrossRefGoogle Scholar
- 23.Buckland, S., Hayes, H., Ostrer, C., et al. (2007). Public information pack (PIP) how to get actively involved in NHS, public health and social care research. So what is it all about? Eastleigh: INVOLVE. Accessed 4 April 2011. http://www.invo.org.uk/pdfs/PIP1whatisitallabout.pdf.
- 24.Haywood, K. L., Lamb, S. E., Hargreaves, J., & White, R. (2004). Reviewing measures of outcome: Reliability of data extraction. Journal of Evaluation in Clinical Practice, 10(2), 329–337.PubMedCrossRefGoogle Scholar
- 25.Fukuda, K., Straus, S. E., Hickie, I., Sharpe, M. C., Dobbins, J. G., & Komaroff, A. (1994). The chronic fatigue syndrome: A comprehensive approach to its definition and study. International Chronic Fatigue Syndrome Study Group. Annals of Internal Medicine, 121(12), 953–959.PubMedGoogle Scholar
- 26.Bou-Holaigah, I., Rowe, P. C., Kan, J., & Calkins, H. (1995). The relationship between neurally mediated hypotension and the chronic fatigue syndrome. Journal of the American Medical Association, 274(12), 961–967.PubMedCrossRefGoogle Scholar
- 27.Wagner, D., Nisenbaum, R., Heim, C., Jones, J. F., Unger, E. R., & Reeves, W. C. (2005). Psychometric properties of the CDC Symptom Inventory for assessment of Chronic Fatigue Syndrome. Population Health Metrics, 3, 8. doi: 10.1186/1478-7954-3-8.
- 28.Nijs, J., Vaes, P., Hoof, E. V., & Becker, P. D. (2002). Activity limitations and participation restrictions in patients with Chronic Fatigue Syndrome—construction of a disease specific questionnaire. Journal of Chronic Fatigue Syndrome, 10(3–4), 3–23.CrossRefGoogle Scholar
- 29.Lloyd, A. R., Hickie, I., Boughton, C. R., Spencer, O., & Wakefield, D. (1990). Prevalence of chronic fatigue syndrome in an Australian population. Medical Journal of Australia, 153(9), 522–528.PubMedGoogle Scholar
- 30.Blakely, A. A., Howard, R. C., Sosich, R. M., et al. (1991). Psychiatric symptoms, personality and ways of coping in chronic fatigue syndrome. Psychological Medicine, 21(2), 347–362.PubMedCrossRefGoogle Scholar
- 31.De Becker, P., McGregor, N., & De Meirleir, K. (2001). A definition-based analysis of symptoms in a large cohort of patients with chronic fatigue syndrome. Journal of Internal Medicine, 250(3), 234–240.PubMedCrossRefGoogle Scholar
- 32.Jason, L. A., Ropacki, M. T., Santoro, N. B., Richman, J. A., Heatherly, W., et al. (1997). A screening instrument for chronic fatigue syndrome: Reliability and validity. Journal of Chronic Fatigue Syndrome, 3(1), 39–59.CrossRefGoogle Scholar
- 33.Friedberg, F., Dechene, L., McKenzie, M. J., & Fontanetta, R. (2000). Symptom patterns in long-duration chronic fatigue syndrome. Journal of Psychosomatic Research, 48(1), 59–68.PubMedCrossRefGoogle Scholar
- 34.Dougall, A. L., Baum, A., & Jenkins, F. J. (1998). Daily fluctuation in Chronic Fatigue Syndrome severity and symptoms. Journal of Applied Biobehavioral Research, 3(1), 12–28.CrossRefGoogle Scholar
- 35.Ray, C., Weir, W. R., Stewart, D., Miller, P., & Hyde, G. (1993). Ways of coping with chronic fatigue syndrome: Development of an illness management questionnaire. Social Science and Medicine, 37(3), 385–391.PubMedCrossRefGoogle Scholar
- 36.Heijmans, M. J. (1998). Coping and adaptive outcome in chronic fatigue syndrome: importance of illness cognitions. Journal of Psychosomatic Research, 45(1 Spec No).Google Scholar
- 37.Knussen, C., & Lee, D. (1998). Chronic fatigue syndrome: Symptoms, appraisal and ways of coping. British Journal of Health Psychology, 3, 111–121.CrossRefGoogle Scholar
- 38.Wagner, D., Nisenbaum, R., et al. (2005) Psychometric properties of the CDC Symptom Inventory for assessment of Chronic Fatigue Syndrome. Population Health Metrics.Google Scholar
- 39.Nijs, J., & Thielemans, A. (2008). Kinesiophobia and symptomology in chronic fatigue syndrome: A psychometric study of two questionnaires. Psychology and Psychotherapy: Theory, Research and Practice., 81, 273–283.CrossRefGoogle Scholar
- 40.Cox, D. (2002). Chronic fatigue syndrome: An evaluation of an occupational therapy inpatient intervention. British Journal of Occupational Therapy, 65(10), 461–468.Google Scholar
- 41.Nijs, J., Almond, F., Dr Becker, P., Truijen, S., & Paul, L. (2008). Can exercise limits prevent post-exertional malaise in chronic fatigue syndrome? An uncontrolled clinical trial. Clinical Rehabilitation, 22, 426–435.PubMedCrossRefGoogle Scholar
- 42.Nijs, J., van Eupen, I., Vandecauter, J., Augustinus, E., Bleyen, G., Moorkens, G., et al. (2009). Can pacing self-management alter physical behavior and symptom severity in chronic fatigue syndrome? A case series. Journal of Rehabilitation Research and Development, 46(7), 985–996.PubMedCrossRefGoogle Scholar
- 43.Moss-Morris, R., & Petrie, K. J. (1997). Cognitive distortions of somatic experiences: Revision and validation of a measure. Journal of Psychosomatic Research, 43(3), 293–306.PubMedCrossRefGoogle Scholar
- 44.Short, K., McCabe, M., & Tooley, G. (2002). Cognitive functioning in Chronic Fatigue Syndrome and the role of depression, anxiety, and fatigue. Journal of Psychosomatic Research, 52(6), 475–483.PubMedCrossRefGoogle Scholar
- 45.Spielberger, C., Jacobs, G., Russell, S., & Crane, R. (1983). The Assessment of anger: The State-Trait Anger Scale. In J. N. Butcherem & C. Spielberger (Eds.), Advances in personality assessment (pp. 159–187). Hillsdale, NJ: Lawrence Erlbaum Associates.Google Scholar
- 46.Spielberger, C. D., Gorsuch, R. L., & Lushene, R. E. (1970). Test manual for the state-trait anxiety inventory. Palo Alto, CA: Consulting Pyschologists Press.Google Scholar
- 47.Beck, A. T., Ward, C. H., Mendelson, M., et al. (1961). An inventory for measuring depression. Archives of General Psychiatry, 4, 561–571.PubMedCrossRefGoogle Scholar
- 48.Derogatis, L. R., & Melisaratos, N. (1983). The brief symptom inventory: An introductory report. Psychological Medicine, 13(3), 595–605.PubMedCrossRefGoogle Scholar
- 49.Radloff, L. S. (1977). The CES-D scale: A self-report depression scale for research in the general population. Applied Psychological Measurement, 1, 385–401.CrossRefGoogle Scholar
- 50.Goldberg, D. P. (1972). The detection of psychiatric illness by questionnaire. London: Oxford University Press (Maudsley Monograph no.21).Google Scholar
- 51.Zigmond, A. S., & Snaith, R. P. (1983). The hospital anxiety and depression scale. Acta Psychiatrica Scandinavia, 67, 361–370.CrossRefGoogle Scholar
- 52.Derogatis, L. R., Rickels, K., & Rock, A. (1977). SCL-90-R: Administration, scoring and procedures manual, I. Baltimore, MD: Clinical Psychometric Research.Google Scholar
- 53.Zung, W. W. W. (1965). A self-rating depression scale. Archives of General Psychiatry, 12, 63–70.PubMedCrossRefGoogle Scholar
- 54.Carver, C. S., Scheier, M. F., & Weintraub, J. K. (1989). Assessing coping strategies: A theoretically based approach. Journal of Personality and Social Psychology, 56, 267–283.PubMedCrossRefGoogle Scholar
- 55.Carver, C. S. (1997). If you want to measure coping but your protocol’s too long: Consider the Brief-COPE. International Journal of Behavioural Medicine, 4, 92–100.CrossRefGoogle Scholar
- 56.Folkman, S., & Lazarus, R. S. (1988). Manual of the ways of coping questionnaire. Palo Alta, CA: Consulting Psychologists Press.Google Scholar
- 57.Schreurs, P. J. G., van der Willige, G., Tellegen, B., & Brosschot, J. F. (1993). The Utrecht coping list-manual. Lisse: Swets & Zeitlinger.Google Scholar
- 58.Weinman, X. (1996). The illness perception questionnaire: A new method for assessing the cognitive representation of illness. Psychology and Health, 11, 431–446.CrossRefGoogle Scholar
- 59.Moss-Morris, R., Weinman, J., Petrie, K. J., Horne, R., Cameron, L. D., & Buick, D. (2002). The revised illness perception questionnaire (IPQ-R). Psychology & Health, 17, 1–6.CrossRefGoogle Scholar
- 60.Taillefer, S. S., Kirmayer, L. J., Robbins, J. M., & Lasry, J. C. (2003). Correlates of illness worry in chronic fatigue syndrome. Journal of Psychosomatic Research, 54(4), 331–337.PubMedCrossRefGoogle Scholar
- 61.Browne, G. B., Byrne, C., Roberts, J., Streiner, D., Fitch, M., Corey, P., et al. (1988). The meaning of illness questionnaire: Reliability and validity. Nursing Research, 37, 368–373.PubMedCrossRefGoogle Scholar
- 62.McNair, D. M., Lorr, M., & Dropplemann, L. F. (1992). EdITS manual for the profile of mood states (POMS). San Diego, CA: EdITS/Educational and Industrial Testing Services.Google Scholar
- 63.Lorig, K., Chastain, R. L., Ung, E., Shoor, S., & Holman, H. R. (1989). Development and evaluation of a scale to measure perceived self-efficacy in people with arthritis. Arthritis and Rheumatism, 32(1), 37–44.PubMedCrossRefGoogle Scholar
- 64.Vercoulen, J. H. M. M., Swanink, C. M. A., et al. (1998). The persistence of fatigue in chronic fatigue syndrome and multiple sclerosis: Development of a model. Journal of Psychosomatic Research, 45(6), 507–517.PubMedCrossRefGoogle Scholar
- 65.Rosenberg, M. (1989). Society and the adolescent self-image. Revised Edition. Middletown, CT: Wesleyan University Press.Google Scholar
- 66.Derogatis, L. R. (1987). The derogatis stress profile (DSP): Quantification of psychological distress. Advances in Psychosomatic Medicine, 17, 30–54.PubMedGoogle Scholar
- 67.Friedberg, F., & Krupp, L. B. (1994). A comparison of cognitive behavioral treatment for chronic fatigue syndrome and primary depression. Clinical Infectious Diseases, 18(Suppl 1), S105–S110.PubMedCrossRefGoogle Scholar
- 68.Scheeres, K., Knoop, H., van der Meer, J., & Bleijenberg, G. (2009). Clinical assessment of the physical activity pattern of CFS patients: A validation of three methods. Health and Quality of Life Outcomes, 7, 29.PubMedCrossRefGoogle Scholar
- 69.Hlatky, M. A., Boineau, R. E., & Higginbotham, M. B. (1989). A brief self-administered questionnaire to determine functional capacity: The Duke Activity Status Index. American Journal of Cardiology, 64, 651–654.PubMedCrossRefGoogle Scholar
- 70.Fix, A. J., & Daughton, D. (1988). Human activity profile professional manual. Odessa, FL: Psychological Assessment Resources, Inc.Google Scholar
- 71.Fries, J. F., Cella, D., Rose, M., Krishnan, E., & Bruce, B. (2009). Progress in assessing physical function in arthritis: PROMIS short forms and computerized adaptive testing. The Journal of Rheumatology, 36(9):2061–2066. Accessed 4 April 2011 http://aramis.stanford.edu/downloads/PROMIS%20HAQ%20-%202007.pdf.Google Scholar
- 72.Craig, C. L., Marchall, A. L., Sjostrom, M., Bauman, A. E., et al. (2003). International physical activity questionnaire: 12-country reliability and validity. Medicine and Science in Sports and Exercise, 35(8), 1381–1395.PubMedCrossRefGoogle Scholar
- 73.Chalder, T., Berelowitz, G., Pawlikowska, T., et al. (1993). Development of a fatigue scale. Journal of Psychosomatic Research, 37(2), 147–153.PubMedCrossRefGoogle Scholar
- 74.Vercoulen, J., Swanink, C., Fennis, J. F. M., Galama, J. M. D., van der Meer, J. W. M., & Bleijenberg, G. (1994). Dimensional assessment of chronic fatigue syndrome. Journal of Psychosomatic Research, 38(5), 383–392.PubMedCrossRefGoogle Scholar
- 75.Bailes, S., Libman, E., Baltzan, M., Amsel, R., Schondorf, R., & Fichten, C. S. (2006). Brief and distinct empirical sleepiness and fatigue scales. Journal of Psychosomatic Research, 60(6), 605–613.PubMedCrossRefGoogle Scholar
- 76.Schwartz, S. N. (1993). The measurement of fatigue: A new instrument. Journal of Psychosomatic Research, 37, 753–762.PubMedCrossRefGoogle Scholar
- 77.Fisk, J. D., Ritvo, P. G., Ross, L., Hasse, D. A., Marrie, T. J., & Schlech, W. F. (1994). Measuring the functional impact of fatigue: Initial validation of the fatigue impact scale. Clinical Infectious Diseases, 18(Suppl 1), S79–S83.PubMedCrossRefGoogle Scholar
- 78.Krupp, L. B., LaRocca, N. G., Muir-Nash, J., & Steinberg, A. D. (1989). The fatigue severity scale. Application to patients with multiple sclerosis and systemic lupus erythematosus. Archives of Neurology, 46(10), 1121–1123.PubMedCrossRefGoogle Scholar
- 79.Belza, B. L., Henke, C. J., Yelin, E. H., Epstein, W. V., & Gilliss, C. L. (1993). Correlates of fatigue in older adults with rheumatoid arthritis. Nursing Research, 42, 93–99.PubMedCrossRefGoogle Scholar
- 80.Smets, E. M., Garssen, M., Bonke, B., & De Haes, J. C. (1995). The Multidimensional Fatigue Inventory (MFI) psychometric qualities of an instrument to assess fatigue. Journal of Psychosomatic Research, 39(3), 315–325.PubMedCrossRefGoogle Scholar
- 81.Ray, C., Weir, W., Philips, S., & Cullen, S. (1992). Development of a measure of symptoms in chronic fatigue syndrome: The Profile of Fatigue-Related Symptoms/PFRS. Psychology and Health, 7, 27–43.CrossRefGoogle Scholar
- 82.Wood, G. C., Bentall, R. P., Gopfert, M., & Edwards, R. H. T. (1991). A comparative psychiatric assessment of patients with chronic fatigue syndrome and muscle disease. Psychological Medicine, 21, 619–628.PubMedCrossRefGoogle Scholar
- 83.Cleeland, C. S., & Ryan, K. M. (1994). Pain assessment: global use of the brief pain inventory. Annals Academy of Medicine, 23(2), 129–138.Google Scholar
- 84.Main, C. (1983). The modified somatic perception questionnaire (MSPQ). Journal of Psychosomatic Research, 27(6), 503–514.PubMedCrossRefGoogle Scholar
- 85.Wittenborn, J. R., & Buhler, R. (1979). Somatic discomforts among depressed women. Archives of General Psychiatry, 36(4), 465–471.PubMedCrossRefGoogle Scholar
- 86.Kerns, R. D., Turk, D. C., & Rudy, T. E. (1985). The West Haven-Yale multidimensional pain inventory (WHYMPI). Pain, 23(4), 345–356.PubMedCrossRefGoogle Scholar
- 87.Johns, M. W. (1992). Reliability and factor analysis of the Epworth Sleepiness Scale. Sleep, 15(4), 376–381.PubMedGoogle Scholar
- 88.Meijman, T., & de Vries-Griever, A. (1985). The construction and evaluation of a one-dimensional scale measuring subjective sleep quality. Heijmans bulletins psychologische instituten. Groningen: University of Groningen.Google Scholar
- 89.Cesta, A., Moldofsky, H., & Sammut, C. (1996). The University of Toronto Sleep Assessment Questionnaire. Sleep Research, 25, 486.Google Scholar
- 90.Douglass, Ab., Bornstein, R., Nino-Murcia, G., Keenan, S., Miles, L., et al. (1994). The Sleep Disorders Questionnaire I: Creation and multivariate structure of SDQ. Sleep, 17, 160–167.PubMedGoogle Scholar
- 91.Lee, K. A. (1991). Fatigue in employed childbearing women. In Proceedings of the international nursing research conference (p. 432). Los Angeles, CA: American Nurses Association.Google Scholar
- 92.Ellis, B. W., Johns, M. W., Lancaster, R., Raptopoulos, P., Angelopoulos, N., & Priest, R. G. (1981). The St Mary’s Hospital Sleep Questionnaire: A study of reliability. Sleep, 4(1), 93–97.PubMedGoogle Scholar
- 93.Hoddes, E., Zarcone, V., & Smythe, H. (1973). Quantification of sleepiness: A new approach. Psychophysiology, 10, 431–437.PubMedCrossRefGoogle Scholar
- 94.Whiteneck, G. G., Charlifue, S. W., Gerhart, K. A., Overholser, J. D., & Richardson, G. N. (1992). Quantifying handicap: A new measure of long-term rehabilitation outcomes. Archives of Physical Medicine and Rehabilitation, 73, 519–526.PubMedGoogle Scholar
- 95.Cohen, S., & Hoberman, H. M. (1983). Positive events and social supports as buffers of life changes stress. Journal of Applied Social Psychology, 13, 99–125.CrossRefGoogle Scholar
- 96.Cella, M., & Chalder, T. (2010). Measuring fatigue in clinical and community settings. Journal of Psychosomatic Research, 69(1), 17–22.PubMedCrossRefGoogle Scholar
- 97.Stulemeijer, M., de Jong, L., et al. (2005). Cognitive behaviour therapy for adolescents with chronic fatigue syndrome: Randomised controlled trial. BMJ, 330(7481), 15.CrossRefGoogle Scholar
- 98.Kempke, S., Goossens, L., Luyten, P., Bekaert, P., Van Houdenhove, B., & Van Wambeke, P. (2010). Predictors of outcome in a multi-component treatment program for chronic fatigue syndrome. Journal of Affective Disorders, 126(1–2), 174–179.PubMedCrossRefGoogle Scholar
- 99.Morriss, R. K., Wearden, A. J., et al. (1998). Exploring the validity of the Chalder Fatigue scale in chronic fatigue syndrome. Journal of Psychosomatic Research, 45(5), 411–417.PubMedCrossRefGoogle Scholar
- 100.Taylor, R. R., Jason, L. A., & Torres, A. (2000). Fatigue rating scales: An empirical comparison. Psychological Medicine, 30, 849–856.PubMedCrossRefGoogle Scholar
- 101.Ware, J. E. (1997). SF-36 health survey. Manual and interpretation guide, 2nd edn. The Health Institute, New England Medical Centre, Boston, MA, Nimrod Press.Google Scholar
- 102.The EuroQol Group. (1990). EuroQol: A new facility for the measurement of health-related quality of life. Health Policy, 16, 199–208.CrossRefGoogle Scholar
- 103.Hunt, S. M., McKenna, S. P., McEwen, J., Backett, E. M., Williams, J., & Papp, E. (1980). A quantitative approach to perceived health status: A validation study. Journal of Epidemiology and Community Health, 34, 281–286.PubMedCrossRefGoogle Scholar
- 104.Ruta, D. A., Garratt, A. M., Leng, M., Russell, I. T., & MacDonald, L. M. (1994). A new approach to the measurement of quality of life. The patient-generated index. Medical Care, 32(11), 1109–1126.PubMedCrossRefGoogle Scholar
- 105.Ferrans, C. E., & Powers, M. J. (1985). Quality of life index: Development and psychometric properties. Advances in Nursing Science, 8, 15–24.PubMedGoogle Scholar
- 106.Burckhardt, C. S., & Anderson, K. L. (2003). The Quality of Life Scale (QOLS): Reliability, validity and utilization. Health and Quality of Life Outcomes, 1, 60.PubMedCrossRefGoogle Scholar
- 107.Ware, J. E., Kosinski, M., & Dewey, J. E. (2000). How to score version two of the SF-36 Health Survey (standard and acute forms). Lincoln, RI: Quality Metric Inc.Google Scholar
- 108.Bergner, M., Bobbitt, R. A., Carter, W. B., et al. (1981). The sickness impact profile: Development and final revision of a health status measure. Medical Care, 19, 787–805.PubMedCrossRefGoogle Scholar
- 109.WHOQoL Group. (1994). The development of the World Health Organisation quality of life assessment instrument (the WHOQoL). In J. Orley & W. Kuyken (Eds.), Quality of life assessment: International perspectives (pp. 41–47). Berlin: Springer.CrossRefGoogle Scholar
- 110.WHOQoL Group. (1996). World Health Organisation Quality of Life—Brief Form (WHOQoL-BREF). Geneva: World Health Organisation.Google Scholar
- 111.Myers, C., & Wilks, D. (1999). Comparison of Euroqol EQ-5D and SF-36 in patients with chronic fatigue syndrome. Quality of Life Research, 8(1–2), 9–16.PubMedCrossRefGoogle Scholar
- 112.Lowry, T. J., & Pakenham, K. I. (2008). Health-related quality of life in chronic fatigue syndrome: Predictors of physical functioning and psychological distress. Psychology, Health and Medicine, 13(2), 222–238.CrossRefGoogle Scholar
- 113.Komaroff, A. L., Fagioli, L. R., Doolittle, T. H., et al. (1996). Health status in patients with chronic fatigue syndrome and in general population and disease comparison groups. American Journal of Medicine, 101(3), 281–290.PubMedCrossRefGoogle Scholar
- 114.Hewlett, S., Hehir, M., & Kirwan, J. R. (2007). Measuring fatigue in rheumatoid arthritis: A systematic review of scales in use. Arthritis and Rheumatism, 57(3), 429–439.PubMedCrossRefGoogle Scholar
- 115.Johnson, S. K., DeLuca, J., & Natelson, B. H. (1996). Depression in fatiguing illness: Comparing patients with chronic fatigue syndrome, multiple sclerosis and depression. Journal of Affective Disorders, 39(1), 21–30.PubMedCrossRefGoogle Scholar
- 116.Kirshner, B., & Guyatt, G. (1985). A methodological framework for assessing health indices. Journal of Chronic Diseases, 38, 27–36.PubMedCrossRefGoogle Scholar
- 117.Mokkink, L. B., Terwee, C. B., Knol, D. L., et al. (2010). The COSMIN checklist for evaluating the methodological quality of studies on measurement properties: A clarification of its content. BMC Medical Research Methodology, 10, 22.PubMedCrossRefGoogle Scholar
- 118.Nicklin, J., Cramp, F., Kirwan, J., Urban, M., & Hewlett, S. (2010). Collaboration with patients in the design of patient-reported outcome measures: Capturing the experience of fatigue in rheumatoid arthritis. Arthritis Care Research (Hoboken), 62(11), 1552–1558.CrossRefGoogle Scholar
- 119.Staniszewska, S., Haywood, K. L., Brett, J., & Tutton, E. (2011). Patient and public involvement in PROMS: Evolution not revolution. The Patient (in press).Google Scholar
- 120.Patrick, D. L., Burke, L. B., Powers, J. H., Scott, J. A., Rock, E. P., et al. (2007). Patient-reported outcomes to support medical product labelling claims: FDA perspective. Value in Health, 10(Suppl 2), S125–S137.PubMedCrossRefGoogle Scholar
- 121.NICE Guideline (Consultation). Chronic fatigue syndrome/myalgic encephalomyelitis (or encephalopathy): diagnosis and management of chronic fatigue syndrome/myalgic encephalomyelitis (or encephalopathy) in adults and children. Draft for Consultation. September 2006. National Collaborating Centre for Primary Care. Accessed 4 April 2011. http://www.nice.org.uk/guidance/index.jsp?action=download&r=true&o=34187.
- 122.Mokkink, L. B., Terwee, C. B., Patrick, D. L., et al. (2010). The COSMIN checklist for assessing the methodological quality of studies on measurement properties of health status measurement instruments: An international Delphi study. Quality of Life Research, 19, 539–549.PubMedCrossRefGoogle Scholar
- 123.Garratt, A. M. (2009). Patient reported outcome measures in trials. British Medical Journal, 338, a2597.PubMedCrossRefGoogle Scholar
- 124.Gandhi, G. Y., Murad, M. H., Fujiyoshi, A., Mullan, R. J., Flynn, D. N., et al. (2008). Patient-important outcome in registered trials. Journal of the American Medical Association, 299(21), 2543–2549.PubMedCrossRefGoogle Scholar
- 125.Montori, V. M., Gandhi, G. Y., & Guyatt, G. H. (2007). Patient-important outcome in diabetes–time for consensus. Lancet, 370(9593), 1104–1106.PubMedCrossRefGoogle Scholar
- 126.Kirwan, J. R., Newman, S., Tugwell, P. S., et al. (2009). Progress on incorporating the patient perspective in outcome assessment in rheumatology and the emergence of life impact measures at OMERACT 9. The Journal of Rheumatology, 36(9), 2071–2076.PubMedCrossRefGoogle Scholar
- 127.Haywood, K., Marshall, S. S., & Fitzpatrick, R. (2006). Patient participation in the consultation process: A structured review of intervention strategies. Patient Education and Counselling, 63(1–2), 12–23.CrossRefGoogle Scholar