Reference
- Ward MM. Health-related quality of life in ankylosing spondylitis: a survey of 175 patients. Arthritis Care Res 1999;12:247–55.
- Calin A. The individual with ankylosing spondylitis: Defining disease status and the impact of illness. Br J Rheumatol 1995;34:663–72.
- van der Heijde D, Calin A, Dougados M, Khan MA, van der Linden S, Bellamy N. Selection of instruments in the core set for DC-ART, SMARD, physical therapy, and clinical record keeping in ankylosing spondylitis. Progress report of the ASAS working group. J Rheumatol 1999;26:951–4.
- Hunt SM, McKenna SP, McEwen J, Williams J, Papp E. The Nottingham Health Profile: Subjective health status and medical consultations. Soc Sci Med 1981;15A:221–9.
- Ware JE, Sherbourne CD. The MOS 36-item short-form health survey (SF-36). I. Conceptual framework and item selection. Med Care 1992;30:473–83.
- Fries JF, Spitz P, Kraines RG, Holman HR. Measurement of patient outcome in arthritis. Arthritis Rheum 1980;23:137–45.
- Meenan RF, Gertman PM, Mason JH. Measuring health status in arthritis: The Arthritis Impact Measurement Scales. Arthritis Rheum 1980;231:46–52.
- Meenan RF, Mason JH, Anderson JJ, Guccione AA, Kazis LE. AIMS2: The content and properties of a revised and expanded Arthritis Impact Measurement Scales health status questionnaire. Arthritis Rheum 1992;35: 1–10.
- Dougados M, Gueguen A, Nakache J-P, Nguyen M, Mery C, Amor B. Evaluation of a functional index and an articular index in ankylosing spondylitis. J Rheumatol 1988;15:302–7.
- Moncur C, Cannon GW, Shaw M, Willardson D, Clegg DO. Inter-observer reliability of the Spondylitis Functional Index instrument for assessing spondylarthropathies. Arthritis Care Res 1996;3:182–8.
- Daltroy LH, Larson MG, Roberts WN, Liang MH. A modification of the Health Assessment Questionnaire for spondyloarthropathies. J Rheumatol 1990;17:946–50.
- Calin A, Garrett S, Whitelock H, Kennedy LG, O'Hea J. A new approch to defining functional ability in ankylosing spondylitis: The development of the Bath Ankylosing Spondylitis Functional Index (BASFI). J Rheumatol 1994;21:2281–5.
- Abbott CA, Helliwell PS, Chamberlain MA. Functional assessment in ankylosing spondylitis: Evaluation of a new self-administered questionnaire and correlation with anthro-pometric variables. Br J Rheumatol 1994;33:1060–6.
- Cronstedt H, Waldner A, Stenstrom CH. The Swedish version of the Bath Ankylosing Spondylitis Functional Index. Reliability and validity. Scand J Rheumatol 1999;28 Suppl 111:1–9.
- Harwood KL, Dziedzic K, Dawes PT, Garratt AM. A systematic review of clinical outcome measures in ankylosing spondylitis (AS). Br J Rheumatol 1998;37 Suppl 1:43.
- van der Linden S, Valkenburg HA, Cats A. Evaluation of diagnostic criteria for ankylosing spondylitis. A proposal for modification of the New York criteria. Arthritis Rheum 1984;27:361–8.
- Helliwell PS, personal communication.
- Richman J, Madrides L, Prince B. Research methodology and applied statistics, Part 3: Measurement procedures in research. Phys Canada 1980;32: 253–7.
- Hidding A, van Santen M, De Klerk E, Gielen X, Boers M. Comparison between self-report measures and clinical obser-vations of functional disability in ankylosing spondylitis, rheumatoid arthritis and fibromyalgia. J Rheumatol 1994;21:818–23.