Table 4.
Sufficient rate for Severin grade (I + II/total)
| Years | Hips | Severin I + II/total | % | Chi-square test |
|---|---|---|---|---|
| 1994 | 835 | 604/835 | 72.3 | χ2 = 5.464 |
| 2008 | 628 | 488/628 | 77.7 | 2008 > 1994 p < 0.05 |
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