Table 1 Type of foreign body

Plant FBs

564

89.10%

 peanut (or shell)

99

15.64%

 melon seed (or shell)

68

10.74%

 walnut kernel

56

8.85%

 chestnut (or shell)

72

11.37%

 soybean

45

7.11%

 pulp (or shell, or stem)

79

12.48%

 scallion

59

9.32%

 pine nut

53

8.37%

 almond

33

5.21%

plastic product

7

1.11%

milk tea bead

5

0.79%

pen cap

8

1.26%

the wick for LED lamp

1

0.16%

bone-like FB

25

3.95%

grass spike

2

0.32%

pine needle

2

0.32%

spicy striped meat

1

0.16%

teeth

2

0.32%

hair

2

0.32%

particle (unknown object)

2

0.32%

thread ends

1

0.16%

packaging bag

2

0.32%

unknown object

9

1.42%