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| Study | Time | Treatment group | Outcome | No. improved | No. of pts | Risk (%) | Risk Difference | NNT |
| Altman 1998 | 14‐26 wk | T: Hyalgan | Number of patients with moderate/marked pain | 69 | 105 | 66 | 4% | 25 |
| C: Naproxen | 70 | 113 | 62 |
