This aspect can be distinguished from what is purely association, such as the fact that the persistence of inflammatory activity clinically or biologically measured over a period of time is associated with a greater radiological deterioration at the end of that period.
In the different studies on prognostic factors Keto Viante, the prognostic variables are mixed with the association variables. On the other hand, it is common to observe how the same initial prognostic factors are used as outcome measures (this is the case, for example,
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