Table 1.
Reduction rate
| Years | Hips | Reduction rate | % | Chi-square test |
|---|---|---|---|---|
| 1994 | 2481 | 1990/2481 | 80.2 | χ2 = 1.834 |
| 2008 | 1523 | 1248/1523 | 81.9 | NS p = 0.05 |
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