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In vitro platelet-rich plasma and muscle studies – variables reported
| Outcome | Studies reporting, n (%) | Significant increase, n | No significant change, n | Significant decrease, n |
| Cell viability | 2 (33.3) | 2 | 0 | 0 |
| Cell proliferation | 5 (83.3) | 5 | 0 | 0 |
| Proteoglycan and collagen content | 0 (0) | 0 | 0 | 0 |
| Gene expression | 5 (83.3) | 4 | 0 | 1 |
| Cell migration | 1 (16.7) | 1 | 0 | 0 |
| Cell differentiation | 3 (50) | 3 | 0 | 0 |
| Inflammatory mediation | 0 (0) | 0 | 0 | 0 |
