异物滞留时间

≤24 h

24 h < t ≤ 3 d

3 d < t ≤ 7 d

>7 d

不详

合计

例数(百分比)

55 (40.4%)

31 (22.8%)

21 (15.4%)

28 (20.6%)

1 (0.7%)

136 (100%)