Fig. 1From: Diagnosis of early stage knee osteoarthritis based on early clinical course: data from the CHECK cohortFinal equations for the four models. For binary outcome, we use the link function of logit. Personal probability of early knee OA can be calculated by using one of the following formulas. Course 1, positive at either time point; course 2, positive at both time points; PF, patellofemoral; JSN, joint space narrowingBack to article page