TABLE 2. Two groups postoperative urinary retention .
| Grade | Control group | Observation group | U value | p value |
|---|---|---|---|---|
| I | 55 | 58 | 0.855 | 0.327 |
| II | 22 | 18 | ||
| III | 4 | 5 | ||
| IV | 1 | 2 |
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