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Table 1 Functional outcome in rheumatoid arthritis

From: The determination and measurement of functional disability in rheumatoid arthritis

Is a dichotomous or binary event that can be thought of as representing an underlying continuum
Is defined by a time variable
Is both a patient outcome and a disease outcome
May be defined by an observed or latent variable
Can be identified using area under the curve methods
Can be identified using the sustained level method