Fig. 1From: Joint index vector: a novel assessment measure for stratified medicine in patients with rheumatoid arthritisJoint index vector. a Diagram for joint index vector V (x, y, z). Vector Vxy (x, y) is an orthographic projection of the vector V (x, y, z) to the XY plane. b Scatter plots between |Vxy| and z. |Vxy| is the scalar of vector Vxy. Vectors of large-joint-dominant patients are distributed in the shaded area (z > 0.2)Back to article page