Table 4.
Summary of Results of Between-Site and Between-Group Analysis of Variance in Apparent Density of Cartilage and Concentration of sGAG.
| Apparent Density (HU) |
|||
|---|---|---|---|
| df | F | Pr(>F) | |
| Between-site | |||
| Early-phase OA | 2 | 2.601 | 0.098 ^ |
| Late-phase OA | 2 | 5.835 | 0.0074** |
| Control | 2 | 1.108 | 0.32 |
| Between-group | |||
| Site 1 | 2 | 1.971 | 0.165 |
| Site 2 | 2 | 0.955 | 0.403 |
| Site 3 | 2 | 1.477 | 0.252 |
| μg CSC per mg cartilage | |||
| Between sites | |||
| Early-phase OA | 2 | 2.698 | 0.089 ^ |
| Late-phase OA | 2 | 2.026 | 0.15 |
| Controls | 2 | 0.591 | 0.574 |
| Between groups | |||
| Site 1 | 2 | 8.083 | 0.0027*** |
| Site 2 | 2 | 9.148 | 0.0014*** |
| Site 3 | 2 | 3.249 | 0.0589 ^ |
OA = osteoarthritis; sGAG = sulfated glycosaminoglycan; CSC = chondroitin sulfate-C.
^P < 0.1. *P < 0.05. **P < 0.01. ***P < 0.005.