Fig 3. Log relative hazard of 4-point MACEs for relative CD34⁺ cell counts in the restricted cubic spline curve.

The reference is the cut-off point between the lowest and medium tertiles; the two vertical dotted lines indicate the cut-off for these tertiles (0.06 and 0.09, respectively). The graph has three knots that are truncated at the 1^st and 99^th percentiles.