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26
Cocks K, King MT, Velikova G, Martyn St-James M, Fayers PM, Brown JM. Evidence-Based Guidelines for Determination of Sample Size and Interpretation of the European Organisation for the Research and Treatment of Cancer Quality of Life Questionnaire Core 30. J Clin Oncol 2011;29:89-96. [PMID: 21098316 DOI: 10.1200/jco.2010.28.0107] [Citation(s) in RCA: 461] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]  Open
27
Scott NW, Fayers PM, Aaronson NK, Bottomley A, de Graeff A, Groenvold M, Gundy C, Koller M, Petersen MA, Sprangers MAG. Interpretation of differential item functioning analyses using external review. Expert Rev Pharmacoecon Outcomes Res 2010;10:253-8. [PMID: 20545590 DOI: 10.1586/erp.10.22] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
28
Scott NW, Fayers PM, Aaronson NK, Bottomley A, de Graeff A, Groenvold M, Gundy C, Koller M, Petersen MA, Sprangers MAG. Differential item functioning (DIF) analyses of health-related quality of life instruments using logistic regression. Health Qual Life Outcomes 2010;8:81. [PMID: 20684767 PMCID: PMC2924271 DOI: 10.1186/1477-7525-8-81] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Accepted: 08/04/2010] [Indexed: 11/10/2022]  Open
29
Kvam AK, Wisløff F, Fayers PM. Minimal important differences and response shift in health-related quality of life; a longitudinal study in patients with multiple myeloma. Health Qual Life Outcomes 2010;8:79. [PMID: 20678240 PMCID: PMC2922103 DOI: 10.1186/1477-7525-8-79] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Accepted: 08/03/2010] [Indexed: 01/22/2023]  Open
30
Baxter JP, Fayers PM, McKinlay AW. The clinical and psychometric validation of a questionnaire to assess the quality of life of adult patients treated with long-term parenteral nutrition. JPEN J Parenter Enteral Nutr 2009;34:131-42. [PMID: 19920205 DOI: 10.1177/0148607109348612] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
31
Scott NW, Fayers PM, Aaronson NK, Bottomley A, de Graeff A, Groenvold M, Gundy C, Koller M, Petersen MA, Sprangers MAG. The practical impact of differential item functioning analyses in a health-related quality of life instrument. Qual Life Res 2009;18:1125-30. [PMID: 19653125 DOI: 10.1007/s11136-009-9521-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Accepted: 07/11/2009] [Indexed: 11/29/2022]
32
Fielding S, Fayers PM, Ramsay CR. Investigating the missing data mechanism in quality of life outcomes: a comparison of approaches. Health Qual Life Outcomes 2009;7:57. [PMID: 19545408 PMCID: PMC2711047 DOI: 10.1186/1477-7525-7-57] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Accepted: 06/22/2009] [Indexed: 11/10/2022]  Open
33
Fayers PM, King MT. How to guarantee finding a statistically significant difference: the use and abuse of subgroup analyses. Qual Life Res 2009;18:527-30. [PMID: 19343540 DOI: 10.1007/s11136-009-9473-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2008] [Accepted: 03/16/2009] [Indexed: 11/28/2022]
34
Fayers PM, King MT. In reply to Berger "don't test for baseline imbalances unless they are known to be present?". Qual Life Res 2009;18:401-2. [PMID: 19253032 DOI: 10.1007/s11136-009-9458-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Accepted: 02/09/2009] [Indexed: 11/26/2022]
35
Scott NW, Fayers PM, Aaronson NK, Bottomley A, de Graeff A, Groenvold M, Gundy C, Koller M, Petersen MA, Sprangers MAG. Differential item functioning (DIF) in the EORTC QLQ-C30: a comparison of baseline, on-treatment and off-treatment data. Qual Life Res 2009;18:381-8. [PMID: 19247808 DOI: 10.1007/s11136-009-9453-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2008] [Accepted: 01/31/2009] [Indexed: 10/21/2022]
36
Robertson C, Langston AL, Stapley S, McColl E, Campbell MK, Fraser WD, Maclennan G, Selby PL, Ralston SH, Fayers PM. Meaning behind measurement: self-comparisons affect responses to health-related quality of life questionnaires. Qual Life Res 2009;18:221-30. [PMID: 19142744 DOI: 10.1007/s11136-008-9435-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2008] [Accepted: 12/15/2008] [Indexed: 11/26/2022]
37
Fayers PM. Evaluating the effectiveness of using PROs in clinical practice: a role for cluster-randomised trials. Qual Life Res 2008;17:1315-21. [PMID: 18821031 DOI: 10.1007/s11136-008-9391-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Accepted: 08/27/2008] [Indexed: 11/30/2022]
38
Scott NW, Fayers PM, Aaronson NK, Bottomley A, de Graeff A, Groenvold M, Gundy C, Koller M, Petersen MA, Sprangers MAG. A simulation study provided sample size guidance for differential item functioning (DIF) studies using short scales. J Clin Epidemiol 2008;62:288-95. [PMID: 18774693 DOI: 10.1016/j.jclinepi.2008.06.003] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Revised: 05/14/2008] [Accepted: 06/17/2008] [Indexed: 10/21/2022]
39
Fielding S, Fayers PM, McDonald A, McPherson G, Campbell MK. Simple imputation methods were inadequate for missing not at random (MNAR) quality of life data. Health Qual Life Outcomes 2008;6:57. [PMID: 18680574 PMCID: PMC2531086 DOI: 10.1186/1477-7525-6-57] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2008] [Accepted: 08/04/2008] [Indexed: 11/13/2022]  Open
40
Cocks K, King MT, Velikova G, Fayers PM, Brown JM. Quality, interpretation and presentation of European Organisation for Research and Treatment of Cancer quality of life questionnaire core 30 data in randomised controlled trials. Eur J Cancer 2008;44:1793-8. [PMID: 18599286 DOI: 10.1016/j.ejca.2008.05.008] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Accepted: 05/19/2008] [Indexed: 11/26/2022]
41
Fayers PM. The scales were highly correlated: P = 0.0001. Qual Life Res 2008;17:651-2. [DOI: 10.1007/s11136-008-9351-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2008] [Accepted: 04/16/2008] [Indexed: 11/28/2022]
42
King MT, Fayers PM. Making quality-of-life results more meaningful for clinicians. Lancet 2008;371:709-10. [PMID: 18313491 DOI: 10.1016/s0140-6736(08)60324-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
43
Baxter JP, Fayers PM, McKinlay AW. The development and translation of a treatment-specific quality of life questionnaire for adult patients on home parenteral nutrition. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.eclnm.2007.10.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
44
Hølen JC, Saltvedt I, Fayers PM, Hjermstad MJ, Loge JH, Kaasa S. Doloplus-2, a valid tool for behavioural pain assessment? BMC Geriatr 2007;7:29. [PMID: 18093294 PMCID: PMC2234400 DOI: 10.1186/1471-2318-7-29] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2007] [Accepted: 12/19/2007] [Indexed: 11/10/2022]  Open
45
Fayers PM, Langston AL, Robertson C. Implicit self-comparisons against others could bias quality of life assessments. J Clin Epidemiol 2007;60:1034-9. [PMID: 17884598 DOI: 10.1016/j.jclinepi.2007.03.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2006] [Revised: 01/18/2007] [Accepted: 02/07/2007] [Indexed: 11/24/2022]
46
Fayers PM. Applying item response theory and computer adaptive testing: the challenges for health outcomes assessment. Qual Life Res 2007;16 Suppl 1:187-94. [PMID: 17417722 DOI: 10.1007/s11136-007-9197-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2006] [Accepted: 02/13/2007] [Indexed: 10/23/2022]
47
Baxter JP, Fayers PM, McKinlay AW. A review of the instruments used to assess the quality of life of adult patients with chronic intestinal failure receiving parenteral nutrition at home. Br J Nutr 2007;94:633-8. [PMID: 16277762 DOI: 10.1079/bjn20051533] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
48
Groenvold M, Petersen MA, Idler E, Bjorner JB, Fayers PM, Mouridsen HT. Psychological distress and fatigue predicted recurrence and survival in primary breast cancer patients. Breast Cancer Res Treat 2007;105:209-19. [PMID: 17203386 DOI: 10.1007/s10549-006-9447-x] [Citation(s) in RCA: 214] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2006] [Accepted: 10/31/2006] [Indexed: 11/12/2022]
49
Fielding S, Fayers PM, Loge JH, Jordhøy MS, Kaasa S. Methods for handling missing data in palliative care research. Palliat Med 2006;20:791-8. [PMID: 17148533 DOI: 10.1177/0269216306072555] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
50
Hølen JC, Hjermstad MJ, Loge JH, Fayers PM, Caraceni A, De Conno F, Forbes K, Fürst CJ, Radbruch L, Kaasa S. Pain assessment tools: is the content appropriate for use in palliative care? J Pain Symptom Manage 2006;32:567-80. [PMID: 17157759 DOI: 10.1016/j.jpainsymman.2006.05.025] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2006] [Revised: 05/30/2006] [Accepted: 05/31/2006] [Indexed: 11/12/2022]
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