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Meta-regression P Valuesa
| Characteristic | Outcome | |
|---|---|---|
| Pain | Function | |
| PRP category | .629 | .547 |
| Spinning approach | .075 | .153 |
| Activator | .549 | .098 |
| No. of injections | .565 | .249 |
| Randomization confirmed | .642 | .795 |
| Allocation concealment confirmed | .832 | .818 |
| Sufficient blinding | .394 | .407 |
| Control group | .033; .147b | .217 |
| Outcome measure instrument | .921 | NA |
| Follow-up duration | .058 | .228 |
aNA, not applicable; PRP, platelet-rich plasma.
bP value for meta-analysis restricted to high-quality trials.
