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%)