• 1
    Dougados M, van der Linden S, Juhlin R, Huitfeldt B, Amor B, Calin A, et al. The European Spondylarthropathy Study Group preliminary criteria for the classification of spondylarthropathy. Arthritis Rheum 1991; 34: 121827.
  • 2
    Khan MA. Update on spondyloarthropathies. Ann Intern Med 2002; 136: 896907.
  • 3
    Braun J, Bollow M, Siper J. Radiologic diagnosis and pathology of the spondyloarthropathies. Rheum Dis Clin North Am 1998; 24: 697735.
  • 4
    Calin A. Ankylosing spondylitis. Clin Rheum Dis 1985; 11: 4160.
  • 5
    Calin A, Edmunds L, Kennedy LG. Fatigue in ankylosing spondylitis: why is it ignored? J Rheumatol 1993; 20: 9915.
  • 6
    Ward MM. Health-related quality of life in ankylosing spondylitis: a survey of 175 patients. Arthritis Care Res 1999; 12: 24755.
  • 7
    Jones SD, Koh WH, Steiner A, Garrett SL, Calin A. Fatigue in ankylosing spondylitis: its prevalence and relationship to disease activity, sleep, and other factors. J Rheumatol 1996; 23: 48790.
  • 8
    Aaronson LS, Teel CS, Cassmeyer V, Neuberger GB, Pallikkathayil L, Pierce J, et al. Defining and measuring fatigue. Image J Nurs Sch 1999; 31: 4550.
  • 9
    Iriarte J, Subira ML, de Castro P. Modalities of fatigue in multiple sclerosis: correlation with clinical and biological factors. Mult Scler 2000; 6: 12430.
  • 10
    Robb-Nicholson CL, Daltroy L, Eaton H, Gall V, Wright E, Hartley LH, et al. Effects of aerobic conditioning in lupus fatigue: a pilot study. Br J Rheumatol 1989; 28: 5005.
  • 11
    Stewart AL, Hays RD, Wells KB, Rogers WH, Spritzer KL, Greenfield S. Long-term functioning and well-being outcomes associated with physical activity and exercise in patients with chronic conditions in the Medical Outcomes Study. J Clin Epidemiol 1994; 47: 71930.
  • 12
    Wang B, Gladman DD, Urowitz MB. Fatigue in lupus is not correlated with disease activity. J Rheumatol 1998; 25: 8925.
  • 13
    Wolfe F, Hawley DJ, Wilson K. The prevalence and meaning of fatigue in rheumatic disease. J Rheumatol 1996; 23: 140717.
  • 14
    Fifield J, McQuillan J, Tennen H, Sheehan J, Reisine S, Hesselbrock V, et al. History of affective disorder and the temporal trajectory of fatigue in rheumatoid arthritis. Ann Behav Med 2001; 23: 3441.
  • 15
    Van Tubergen A, Coenen J, Landewe R, Spoorenberg A, Chorus A, Boonen A, et al. Assessment of fatigue in patients with ankylosing spondylitis: a psychometric analysis. Arthritis Rheum 2002; 47: 816.
  • 16
    Van der Linden S, Valkenburg HA, Cats A. Evaluation of diagnostic criteria for ankylosing spondylitis: a proposal for the modification of the New York criteria. Arthritis Rheum 1984; 27: 3618.
  • 17
    Garrett S, Jenkinson T, Kennedy LG, Whitelock H, Gaisford P, Calin A. A new approach to defining disease status in ankylosing spondylitis: the Bath Ankylosing Spondylitis Disease Activity Index. J Rheumatol 1994; 21: 228691.
  • 18
    Calin A, Garrett SL, Whitelock H, Kennedy LG, O'Hea J, Mallorie P, et al. A new approach to defining functional ability in ankylosing spondylitis: the development of the Bath Ankylosing Spondylitis Functional Index. J Rheumatol 1994; 21: 22815.
  • 19
    Brandt J, Haibel H, Reddig J, Sieper J, Braun J. Successful short term treatment of severe undifferentiated spondyloarthropathy with the anti-tumor necrosis factor-α monoclonal antibody infliximab. J Rheumatol 2002; 29: 11822.
  • 20
    Claudepierre P, Sibilia J, Goupille P, Flipo RM, Wendling D, Eulry F, et al. Evaluation of French version of the Bath Ankylosing Spondylitis Disease Activity Index in patients with spondyloarthropathy. J Rheumatol 1997; 24: 19548.
  • 21
    Cardiel MH, Londono JD, Gutierrez E, Pacheco-Tena C, Vazquez-Mellado J, Burgos-Vargas R. Translation, cross-cultural adaptation, and validation of the Bath Ankylosing Spondylitis Functional Index (BASFI), the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) and the Dougados Functional Index (DFI) in a Spanish speaking population with spondyloarthropathies. Clin Exp Rheumatol 2003; 21: 4518.
  • 22
    Ware JE Jr, Sherbourne CD. The MOS 36-item short-form health survey (SF-36). I. Conceptual framework and item selection. Med Care 1992; 30: 47383.
  • 23
    Brazier JE, Harper R, Jones NM, O'Cathain A, Usherwood T, Westlake L. Validating the SF-36 health survey questionnaire: new outcome measures for primary care. BMJ 1992; 305: 1604.
  • 24
    Ware JE, Kosinski M, Keller SD. SF-36 physical and mental health summary scales: a user's manual. 4th ed. Boston: The Health Institute; 1994.
  • 25
    Tabachnick BG, Fidell LS. Using multivariate statistics. 2nd ed. New York: Harper and Row; 1989.
  • 26
    Cohen J, Cohen P. Applied multiple regression/correlation analysis for the behavioral sciences. Hillsdale (NJ): Erblaum; 1983.
  • 27
    Aiken LS, West SG. Multiple regression: testing and interpretting interactions. Newbury Park (CA): Sage; 1991.
  • 28
    Hopman WM, Towheed T, Anastasiades T, Tenenhouse A, Poliquin S, Berger C, et al. Canadian normative data for the SF-36 health survey. CMAJ 2000; 163: 26571.
  • 29
    Krupp LB, LaRocca NG, Muir J, Steinberg AD. A study of fatigue in lupus erythematosus. J Rheumatol 1990; 17: 14502.
  • 30
    Cathebras PJ, Robbins JM, Kirmayer L, Haton BC. Fatigue in primary care: prevalence, psychiatric comorbidity, illness behavior, and outcome. J Gen Intern Med 1992; 7: 27686.
  • 31
    Fuhrer R, Wessley S. The epidemiology of fatigue and depression: a French primary-care study. Psychol Med 1995; 25: 895905.
  • 32
    Kirk KM, Hickie IB, Martin NG. Fatigue as related to anxiety and depression in a community-based sample of twins aged over 50. Soc Psychiatry Psychiatr Epidemiol 1999; 34: 8590.
  • 33
    Koschera A, Hickie I, Hadzi-Pavlovic D, Wilson A, Loyd A. Prolonged fatigue, anxiety and depression: exploring relationships in a primary care sample. Aust N Z J Psychiatry 1999; 33: 54552.
  • 34
    Schneider RA. Concurrent validity of the Beck depression inventory and the Multidimensional Fatigue Inventory-20 in assessing fatigue among cancer patients. Psychol Rep 1998; 82: 8836.
  • 35
    Van Tubergen A, Landewe R, van der Heijde D, Hidding A, Wolter N, Asscher M, et al. Combined spa-exercise therapy is effective in patients with ankylosing spondylitis: a randomized controlled trial. Arthritis Rheum 2001; 45: 4308.
  • 36
    Uhrin Z, Kuzis S, Ward MM. Exercise and changes in health status in patients with ankylosing spondylitis. Arch Intern Med 2000; 160: 296975.
  • 37
    Blumenthal JA, Babyak MA, Moore KA, Craighead WE, Herman S, Khatri P, et al. Effects of exercise training on older patients with major depression. Arch Intern Med 1999; 25: 234956.
  • 38
    Neuberger GB, Press AN, Lindsley HB, Hinton R, Cagle PE, Carlson K, et al. Effects of exercise on fatigue, aerobic fitness, and disease activity measures in persons with rheumatoid arthritis. Res Nurs Health 1997; 20: 195204.