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United States (US) versus United Kingdom (UK) in Disease Severity and Joint Deformity at Baseline
| Outcome | US (mean ± standard deviation) | UK (mean ± standard deviation) | p-value |
|---|---|---|---|
| Michigan Hand Outcomes Questionnaire Overall Score | 49 ± 21 | 48 ± 20 | 0.78 |
| Grip strength (kg) | 6.8 ± 7.3 | 8.4 ± 5.4 | 0.10 |
| 2-point pinch strength (kg) | 2.9 ± 1.6 | 2.6 ± 1.4 | 0.29 |
| Ulnar drift (degree) | 34 ± 16 | 38 ± 13 | 0.11 |
| Extensor lag (degree) | 54 ± 23 | 55 ± 19 | 0.76 |
