• 1
    Wiles N, Symmons DP, Harrison B, Barrett E, Barrett JH, Scott DG, et al. Estimating the incidence of rheumatoid arthritis: trying to hit a moving target? Arthritis Rheum 1999; 42: 133946.
  • 2
    Walker-Bone K, Farrow S. Rheumatoid arthritis. Clin Evid (Online) 2007; 1: 1124.
  • 3
    Penta M, Tesio L, Arnould C, Zancan A, Thonnard JL. The ABILHAND questionnaire as a measure of manual ability in chronic stroke patients: Rasch-based validation and relationship to upper limb impairment. Stroke 2001; 32: 162734.
  • 4
    Durez P, Fraselle V, Houssiau F, Thonnard JL, Nielens H, Penta M, et al. Validation of the ABILHAND questionnaire as a measure of manual ability in patients with rheumatoid arthritis. Ann Rheum Dis 2007; 66: 1098105.
  • 5
    Cox SR, McWilliams L, Massy-Westropp N, Meads DM, McKenna SP, Proudman S. Adaptation of the RAQoL for use in Australia. Rheumatol Int 2007; 27: 6616.
  • 6
    Grotle M, Brox JI, Vollestad NK. Concurrent comparison of responsiveness in pain and functional status measurements used for patients with low back pain. Spine 2004; 29: E492501.
  • 7
    Revicki D, Hays RD, Cella D, Sloan J. Recommended methods for determining responsiveness and minimally important differences for patient-reported outcomes. J Clin Epidemiol 2008; 61: 1029.
  • 8
    Cudkowicz ME, Schoenfeld D, Williams L. Improving the responsiveness of rating scales: the challenge of stepping twice into the same river [editorial]. Neurology 2004; 62: 16667.
  • 9
    Wright JG, Young NL. A comparison of different indices of responsiveness. J Clin Epidemiol 1997; 50: 23946.
  • 10
    De Bruin AF, Diederiks JP, de Witte LP, Stevens FC, Philipsen H. Assessing the responsiveness of a functional status measure: the Sickness Impact Profile versus the SIP68. J Clin Epidemiol 1997; 50: 52940.
  • 11
    Beaton DE, Bombardier C, Katz JN, Wright JG. A taxonomy for responsiveness. J Clin Epidemiol 2001; 54: 120417.
  • 12
    Arnett FC, Edworthy SM, Bloch DA, McShane DJ, Fries JF, Cooper NS, et al. The American Rheumatism Association 1987 revised criteria for the classification of rheumatoid arthritis. Arthritis Rheum 1988; 31: 31524.
  • 13
    Van Gestel AM, Prevoo ML, van 't Hof MA, van Rijswijk MH, van de Putte LB, van Riel PL. Development and validation of the European League Against Rheumatism response criteria for rheumatoid arthritis: comparison with the preliminary American College of Rheumatology and the World Health Organization/International League Against Rheumatism criteria. Arthritis Rheum 1996; 39: 3440.
  • 14
    Shrout P, Fleiss J. Intraclass correlations: use in assessing rater reliability. Psychol Bull 1979; 86: 4208.
  • 15
    Portney LG, Watkins MP. Foundations of clinical research. Stamford (CT): Appleton & Lange; 1993. p. 42.
  • 16
    Matza LS, Johnston JA, Faries DE, Malley KG, Brod M. Responsivness of the adult attention-deficit/hyperactivity disorder quality of life scale (AAQoL). Qual Life Res 2007; 16: 151120.
  • 17
    Abetz L, Arbuckle R, Allen RP, Mavraki E, Kirsch J. The reliability, validity and responsiveness of the Restless Legs Syndrome Quality of Life questionnaire (RLSQoL) in a trial population. Health Qual Life Outcomes 2005; 3: 79.
  • 18
    Middle B, van Sonderen E. Statistical significant change versus relevant or important change in (quasi) experimental design: some conceptual and methodological problems in estimating magnitude of intervention-related change in health services research. Int J Integr Care 2002; 2: e15.
  • 19
    Liang MH, Larson MG, Cullen KE, Schwartz JA. Comparative measurement efficiency and sensitivity of five health status instruments for arthritis research. Arthritis Rheum 1985; 28: 5427.
  • 20
    Cohen J. Statistical power analysis for the behavioral sciences. 2nd ed. Hillsdale: Laurence Erlbaum; 1988.
  • 21
    Redelmeier DA, Tversky A. Discrepancy between medical decisions for individual patients and for groups. N Engl J Med 1990; 322: 11624.
  • 22
    Wright BD, Stone MH. Best test design. Chicago: Mesa Press; 1979.
  • 23
    Sloan JA, Cella D, Frost M, Guyatt GH, Sprangers M, Symonds T, and the Clinical Significance Consensus Meeting Group. Assessing clinical significance in measuring oncology patient quality of life: introduction to the symposium, content overview and definition of terms. Mayo Clin Proc 2002; 77: 36770.
  • 24
    Sloan JA, Symonds T, Vargas-Chanes D, Fridley B. Practical guidelines for assessing the clinical significance of health-related quality of life change within clinical trials. Drug Inform J 2003; 37: 2331.
  • 25
    Fulk GD, Echternach JL. Test-retest reliability and minimal detectable change of gait speed in individuals undergoing rehabilitation after stroke. J Neurol Phys Ther 2008; 32: 813.
  • 26
    Rohekar G, Pope J. Test-retest reliability of patient global assessment and physician global assessment in rheumatoid arthritis. J Rheumatol 2009; 36: 217882.
  • 27
    De Jong Z, van der Heijde D, McKenna SP, Whalley D. The reliability and construct validity of the RAQoL: a rheumatoid arthritis-specific quality of life instrument. Br J Rheumatol 1997; 36: 87883.
  • 28
    Dworkin RH, Turk DC, Wyrwich KW, Beaton D, Cleeland CS, Farrar JT, et al. Interpreting the clinical importance of treatment outcomes in chronic pain clinical trials: IMMPACT recommendations. J Pain 2008; 9: 10521.
  • 29
    Pallant J. SPSS survival manual: a step by step guide to data analysis using SPSS for windows. 3rd edition. New York: McGraw Hill; 2007.
  • 30
    Kazis LE, Anderson JJ, Meenan RF. Effect sizes for interpreting changes in health status. Med Care 1989; 27: S17889.
  • 31
    Hobart JC, Cano SJ, Thompson AJ. Effect sizes can be misleading: is it time to change the way we measure change? J Neurol Neurosurg Psychiatry 2010; 81: 10448.