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. 2023 Feb 8;10:1101516. doi: 10.3389/fnut.2023.1101516

Figure 1.

Figure 1

Serum concentrations of matrix metalloproteinases (MMP-1, MMP-3, and MMP-13) and cartilage oligomeric matrix protein (COMP) of healthy controls and patients with knee osteoarthritis according to vitamin D status. Healthy control group, n = 65; vitamin D sufficient group, n = 60, vitamin D insufficient group, n = 64. Vitamin D sufficient and insufficient was defined as serum 25(OH)D concentrations ≥30 ng/mL and serum 25(OH)D concentrations <30 ng/mL, respectively. Data are shown as median (interquartile range). P-values obtained from Kruskal-Wallis test. P < 0.05 was considered significant.