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REFERENCES

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    Brown JH, Kazis LE, Spitz PW, Gertman P, Fries JF, Meenan RF. The dimensions of health outcomes: a cross-validated examination of health status measurement. Am J Public Health 1984; 74: 15961.
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    Felson DT, Anderson JJ, Boers M, Bombardier C, Chernoff M, Fried B, et al. The American College of Rheumatology preliminary core set of disease activity measures for rheumatoid arthritis clinical trials. Arthritis Rheum 1993; 36: 72940.
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    Wolfe F, Lassere M, van der Heijde D, Stucki G, Suarez-Almazor M, Pincus T, et al. Preliminary core set of domains and reporting requirements for longitudinal observational studies in rheumatology. Omeract IV: outcome measures in rheumatology. Cancun, Mexico, April 16–20, 1998. J Rheumatol 1999; 26: 4849.
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    Hubert HB, Bloch DA, Fries JF. Risk factors for physical disability in an aging cohort: the NHANES I Epidemiologic Followup Study. J Rheumatol 1993; 20: 4808.
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    Fries JF, Singh G, Morfeld D, Hubert HB, Lane NE, Brown BW. Running and the development of disability with age. Ann Intern Med 1994; 121: 5029.
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    Vita AJ, Terry RB, Hubert HB, Fries JF. Aging, health risks, and cumulative disability. N Engl J Med 1998; 338: 103541.
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    Hakala M, Nieminen P, Manelius J. Joint impairment is strongly correlated with disability measured by self-report questionnaires: functional status assessment of individuals with rheumatoid arthritis in a population based series. J Rheumatol 1994; 21: 649.
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    Pincus T, Callahan LF, Sale WG, Brooks AL, Payne LE, Vaughn WK. Severe functional declines, work disability, and increased mortality in seventy-five rheumatoid arthritis patients studied over nine years. Arthritis Rheum 1984; 27: 86472.
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    Mäkisara GL, Mäkisara P. Prognosis of functional capacity and work capacity in rheumatoid arthritis. Clin Rheumatol 1982; 1: 11725.
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    Meenan RF, Gertman PM, Mason JH. Measuring health status in arthritis: the Arthritis Impact Measurement Scales. Arthritis Rheum 1980; 23: 14652.
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    Pincus T, Summey JA, Soraci SA Jr, Wallston KA, Hummon NP. Assessment of patient satisfaction in activities of daily living using a modified Stanford health assessment questionnaire. Arthritis Rheum 1983; 26: 134653.
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    Fries JF. Reevaluating the therapeutic approach to rheumatoid arthritis: the “sawtooth” strategy. J Rheumatol 1990; 17 (Suppl 22): 1215.