| Grade | 0 | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|---|
| n | 592 (57%) | 118 (11%) | 111 (10%) | 183 (18%) | 7 (.06%) | 18 (1.7%) |
| LOS | 7 | 9 | 9 | 12 | 9 | 12 |
P < 0.001.
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