. 2016 Oct 29;22:4062–4065. doi: 10.12659/MSM.897849

Table 2.

Serum and SF gremlin-1 concentrations in different knee OA subgroups.

Gremlin-1 (ng/mL)	Grade 2 (n=64)	Grade 3 (n=91)	Grade 4 (n=57)	P value
Serum	435.40 (339.04–498.35)^b	481.95 (398.58–533.19)^a	533.19 (456.40–596.96)^a,^b	<0.001
SF	267.65 (221.50–313.02)^b	320.39 (257.28–367.09)^a	376.53 (290.01–424.27)^a,^b	<0.001

P<0.01 vs. KL grade 2;

P<0.01 vs. KL grade 3.